Malicious PDF — malware analysis report

Static analysis result for SHA-256 3551c3e6ffc47d0d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6484ab7994ceddb2618feb786825a72 SHA-1: 59137fb580278ab5fac20e11152709b02aba3d83 SHA-256: 3551c3e6ffc47d0dc354af145bd879ee2de6ddf76b3e5c5c112fddb2199fa339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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.
  • 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://geoplan.su/userfiles/file/xagarekuritevivapi.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611edf5d0fdbd---reliwesojaku.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/dikedozuzumada.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d339608500---xiribobamowupinegezi.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/15733866993.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca79a935be---kafeselutesezukus.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fabuguwojumonozevogobuv.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/89078108893.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/1536798476.pdfIn PDF document text
    • https://kham.vn/userfiles/file/46708245312.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1e9ve77u0tunsns8l0v9l96mln/54232816912.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/biniwo.pdfIn PDF document text
    • https://led7.ru/file/38987221877.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607834b015f7b---misibopanova.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/d9od94lhl5rd27m9dbgr774k26/kixubovafovujuv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8e5b5caa---gukeke.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sotagavifob.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f116b3986f---vagesonuluxod.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/42080617097.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nenatuvudotabol.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/brfi8l67i84i829oe1h26ftrq2/nosuwujipene.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/12829375591.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb8db0853---fepisimakalisotaxodol.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ec4db803---gowumobivonizit.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/mibir.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/napafenapusupitotuwo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083a31d3d394---rebinode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=navy+eval+writing+tipsPDF 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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10552 bytes
SHA-256: e3d998490f2eb23724b08a0246cda085837e4390197286aeadbfccef4f88a507
font_01_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 20400 bytes
SHA-256: badebad1deff6fdf205b4705e636fdb8ba713651430416da3ae4a5844c58711e
font_02_sfnt_off00013c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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