Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3545c94b2831809…

MALICIOUS

PDF

133.2 KB Created: 2021-07-17 11:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 747d2035c6bd2a642f64a177edceb977 SHA-1: 115d2cd4473998c3f684d6f17456c46db8ec89dd SHA-256: b3545c94b2831809a270a1e1f4eb313d41998c4b5a955ff86943e5adc443b2c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to distribute further malware or facilitate phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a deliberate tactic for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

Heuristics 6

  • 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.
  • 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://adepotcustom.com/UploadFiles/file/20210619012340177.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/luganudure.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e245132d---71089220473.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0e514de2---19178739318.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/81497700565.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94fa5022c---69262601825.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/59916359146.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/fitepu.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/s0tf5bcsdpsej0ga3c6au2arhg/pofumonawidivikewototox.pdfIn PDF document text
    • http://qa-whg.net/upload/files/megotugamezatalogegox.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/57563723971.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c848130c12---79244524522.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/354497f7eba641acabe5addce1d11829/81900602718.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6d57cbe7ec1fdc43f5e5ab01d88c2823/35012153549.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc592e98685---jejinilugepivobenuju.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd404551d---dikijunida.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/wukegerelidurilipudodivo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mho62q011dr7i53jomgbr48a1/vuxiromivube.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/62037751758.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/ruluduxupuvojewe.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/86c135855b12f4b4381d471d583ec684/mudajemawifekaxatuki.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jelususeladivapararesufof.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd14767d707---duvawaw.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/wesikonos.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e099173b8d---mozulavexuwor.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e171e8b4e---56194575213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cheetah+in+different+languagesPDF 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_off0001a4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCF1 10644 bytes
SHA-256: f3a2b5fb74c335e3ddf63ef981671e1129a19d97114aaa8951e2bc3a1c27923b
font_02_sfnt_off0001d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D507 18508 bytes
SHA-256: cbc7b991a9edd0e20c2ca0418d5323f10def51bbb874c756eab3d1bec4d78e5d

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