Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5c1930fe734b1d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 11:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe9d8a789b64ddbb2b417b246771b11b SHA-1: 18409aa01b6e691de0076e9b8ebe0383ddfa3756 SHA-256: ff5c1930fe734b1d7bc58738c2775344b62f523fcd714fe60780a0b2f71c02cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the true destination or leverage vulnerable sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into making a phone call, consistent with tech-support scams or callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://azizavacanze.com/userfiles/files/gimafigaxa.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/mufot.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/45549209676.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717cc313bb7---18093187487.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902629c84f---67996333566.pdfIn PDF document text
    • https://signika.pl/Upload/file/51671386358.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/48efafb1536d086987cb3408a953c82f/79356712834.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/67s8jfp953vc11lhg28nns2mkf/lunamosotowu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0961e2ab8---dazidefewepaxexorexas.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1f7925d4---derenolufetitaxilimedibi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608494f27745a---8469531296.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/75659952546.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/83501996721.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/2691137891.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27b6b536a---20402279951.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c09da0c09---gefepixalinoziwasunit.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/met44uapk68nd213hkkpp2kdk0/80118217315.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087711341da1---valusolixabevisasodidej.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e9f77a70c696547d5f2f4cf8eed339c0/zexuwatikunuweginajujew.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64969f0539685be1b10efb1e7bfc15a0/35393759913.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/04e9o3s64lkf2ucdsdknnj82ds/duzegu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/86243655158.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pasixipetaxolaxetuwo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0932b2a4083c534a314796c0ce000e29/79050024801.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ff8c09a31005ba2884622759d93778de/fekidodi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r2gek894b7sfnaqjcohca6013l/xelav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=morae+software+for+usability+testingPDF 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_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16632 bytes
SHA-256: b1197b1782a714efb30ee04250064e79bbfb3a8d042b3ad213bcdb1c0c673507
font_02_sfnt_off00013e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0D 10824 bytes
SHA-256: 5be1c8040d2da2a5a305c1e784602740a43a1386250b6ca477135a93229b9be9

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