Malicious PDF — malware analysis report

Static analysis result for SHA-256 a740fe1252d2c4fc…

MALICIOUS

PDF

105.7 KB Created: 2021-10-06 01:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 235abd2d7ce32b720ed2f75f9edcac30 SHA-1: b653f7b057a3ef51dfd6a2dc5eae9045e3dd73d0 SHA-256: a740fe1252d2c4fc63dcac7a69a49ab51783fad0a6e273e8b2e4602ecd577cd7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to potentially compromised upload storage. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 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 https://charlesstreetvideo.com/userfiles/file/57919034888.pdf In PDF document text
    • https://batdongsandothanh.vn/luutru/files/revewajizedaruvikur.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210926071536.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148964778e83---lukawatevob.pdfIn PDF document text
    • https://linardi.ru/files/file/jixipewogonoluxasaku.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161536b514b978---24614086403.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3917398963.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/xukobizolojirirozenum.pdfIn PDF document text
    • https://bselink.com/userfiles/file/nupatesupupif.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kg2lv9s2k5rj6ugm7o26ceqlei/77512484143.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/munitigomimanuv.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/jogosapof.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/rosixuduzaku.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/14222252033.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/xejolimokogiwiv.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/54191786740.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/vazarebujabawokugijavej.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/81316084436.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/baramoniwudulotakix.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/fasonavukuj.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/timikodi.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/wimofovukomebudepudo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/82532745365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cyber+paternalism+definitionPDF 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_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 21884 bytes
SHA-256: f1bb7dfc8a42411b874c10292d8285a3cd6e5d26911cc3e500b6697e1551387d
font_01_sfnt_off00016804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001801b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1801B 10944 bytes
SHA-256: afc0fe4b16bfcc282d8820225d5aa24d3722f6e5741c7ab0fba51f1341ff4274

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