Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c88d8935ff2391c…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 18:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ceab6a8d3a9fe52ae387eadd6b705719 SHA-1: 5b08f5f7f687b4ea0b2ea652f363885caa656d3d SHA-256: 1c88d8935ff2391cce2d1220b186c71ac85ac3b856159bd33f7f5758936afdea
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, characteristic of a link farm used for SEO manipulation or to distribute further malicious content. The presence of these links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ad9b3be093df7e897bc8cbe817efe024/zaluperefubebu.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/meligivi.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/ruraxuga.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vuzasas.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wedivexuviwezivevizesuxis.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/uds21j179tnbfr3l59t9jtbm7d/34728987681.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a22e505a6---funigoxowokix.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833bcf4536c---vapexatifivebovofoba.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d6c50e9e9---68241743723.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/tiwozexepaligesamoretoz.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614205203.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/tunufim.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/877895ed4be29f76ee18f323b62cccf2/lifipojevuwobirisikubejut.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1ec59e110d2bfec4db8d411feb132344/jirabapedobogavidid.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9abc79c23d---69605276807.pdfIn PDF document text
    • http://digifast.cz/userfiles/60208086839.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dokozagas.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/07efad9e92030351b061ae6a3847040d/tugurasarekixonu.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/6742367229.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/859tsgpl1jkguhr0jp0do3snit/vosenuwuzevovaje.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/88786727699.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ffbf1c8f---27062980062.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48c5dcec6---liduloromajiwalatedegu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080abcec668f---pisuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=covalent+bond+crystal+structurePDF 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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 10720 bytes
SHA-256: 9097e3f23eedb8054d9d52104a2b81a09a26b01f67fbb66751e4d56fc27efce5
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 17860 bytes
SHA-256: 213aa1f05098b3cb1f883eaa27345a14e4cc78be38b84017bfccfef8b037259e
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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