Malicious PDF — malware analysis report

Static analysis result for SHA-256 9002a6c3676f5fe9…

MALICIOUS

PDF

89.7 KB Created: 2021-09-09 22:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cd4404d5ab1a1624795ac9a330d891c SHA-1: 4a7855100ba817943f2cb68d268f7914d0ecac0d SHA-256: 9002a6c3676f5fe983138a7f432e086ef64b29c7f87eefbf40455a51184f1e67
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's part of a phishing or scam campaign. The presence of a 'download button' lure and a callback lure further supports this, aiming to trick users into downloading a payload or contacting a scammer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kozszemle.hu/uploads/files/98787038560.pdf In PDF document text
    • http://status-go.net/gfx/userfiles/files/68185350359.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gagivixofatatuwulojanowej.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/51004099580.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/wepixa.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/68635767566.pdfIn PDF document text
    • http://twilaw.com/files/files/vakal.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359094608f4---56508967599.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/32060582845.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/samevoz.pdfIn PDF document text
    • http://master-br.ru/img/file/pebubut.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/89045563237.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338e282dd2a---89046916657.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7bcdf02c---50237975375.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/16434037583.pdfIn PDF document text
    • https://aokman-drive.com/d/files/94104322482.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/meziwaxuwadiv.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/mikapozexipabagonepatik.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/febexere.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sapiwaxetodateg.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pisavujam.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/jagakuxojodezokarixeda.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/naxaf.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zurovanebigafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=akimeji+shimeji+chibis+anime+live+wallpaperPDF 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_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 19604 bytes
SHA-256: 9f78fb27c2d5d88dcfa818b571272c99d1021c62a1a0ff15ff2a0d786fb18d8d
font_02_sfnt_off0001405a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405A 10916 bytes
SHA-256: 8f0b4c894bf1098d5457bf9303116a855ea98eb8e86381d8e06bb6b32e6a30c4

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