Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a81853c650784e0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-22 18:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b02605bc0341cac94f392467fd73386e SHA-1: e91d884f9c51d8021a572c9a84178c5c20b486c7 SHA-256: 3a81853c650784e0615217309ab5d7ab164982cecb4c827a07afeaba5ffe9ec3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. The document body is heavily obfuscated, but heuristics indicate it is a link farm and a callback lure, suggesting it aims to trick users into calling a fraudulent support number. No scripts were extracted, but the presence of numerous links to potentially compromised CMS upload directories indicates a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://patronusalapitvany.hu/public_html/upload/82334906112.pdf In PDF document text
    • http://broadmoor79.com/clients/864886/File/belibedisajuvutupo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/61394664500.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/211133952.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fec345ad---gurodu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca71307aa---51781428315.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb60b08b8---novopinide.pdfIn PDF document text
    • http://stevis.cz/files/file/98270765253.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/46928217557.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/fcldcvnrok3ppad3q672lcr043/vemadeba.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecaf458988---rilokixavubaxusonopa.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nemipo.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a3ff32ad---58374967816.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/butulorogovu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/71934795649.pdfIn PDF document text
    • http://zzquansu.cn/d/files/98876051936.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/wakajifedobapa.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/temurejamobipajas.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/8785207677.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/xepivagiso.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/358794947.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/wirizesafe.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8520bffe---64392214408.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/womevupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=telephone+midwife+appointmentsPDF 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_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 10712 bytes
SHA-256: 962b4e8e644ccb6982db9127a10e2fa1077fbc9eafba709c25a20ae0ce759ee5
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 16452 bytes
SHA-256: 1341c9097c49be89bbe6db45795a9204105dd6e0627d62c94dcaa447c3d0d497
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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