Malicious PDF — malware analysis report

Static analysis result for SHA-256 258a11e11cde72d9…

MALICIOUS

PDF

84.3 KB Created: 2021-10-07 06:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e6a741936fc4da58ff62c5eb104511bb SHA-1: 161dd07e5c4434cc833e17349312818ed5f459ed SHA-256: 258a11e11cde72d986797dbcc0bad4cfe74c6d4738ad7753765a8ff59e07fd49
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic in social engineering attacks to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://drxzhang.com/userfiles/file/60846399812.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/totisetunofo.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/buwomosonugidupenakegi.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/13381688329.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161461ec9da435---tarutatulemunoxuneke.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/87309541292.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/xaxovuxojewepu.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/21825912975.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/53865211901.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/22666047389.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/wakutivogizixabum.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/balapuxil.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202110051123439914.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/nawopolij.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159c7797fe46---47447759429.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uuu8ne29rek53629db5hov4ds6/mewis.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ferivogijame.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/jotutotuteluzagalasaboki.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee49753b06de45c6ed726b57d71e4cdd/lutanamu.pdfIn PDF document text
    • http://langmypham.com/luutru/files/15893681548.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492f98e387a---sumelatativimunadun.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/efko53e36abuhf76oimr06c2s4/zugip.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/55950075631.pdfIn PDF document text
    • http://newo.ru/files/files/razewupomowatir.pdfIn PDF document text
    • https://scalper.ir/data/files/file/37653019054.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/34471466216.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vogerisedumisez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=blue+snowball+ice+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 18764 bytes
SHA-256: 987be266d972e6b2fee8faf9d4803dbcebb2ae3ba4e5a9c60101b6cb4e235803
font_01_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 10572 bytes
SHA-256: 303c4ec30f56313e1ea2784de9993083baa0f71004334243fd710e04cdd0cd8a

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