Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc5b32aa128126a…

MALICIOUS

PDF

82.8 KB Created: 2021-08-21 14:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6b4acb3c7bdf5e58d69b2ef9cf9acb24 SHA-1: 947ce43f27c87b179394f304073028c5eb1f205d SHA-256: 4fc5b32aa128126a1f6890cba932effd0b46588f3153dfb2200fdb362765518c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://altelaw.com/uploads/image/file/96409267654.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2a858085a0b41ba4c1e8b60c8882106e/39529255837.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f294ea63---pirepekizagisowusu.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/20425213856.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xefumesekijugofozuka.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/vikuzebupataf.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb30dab094---51027006358.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/09a04344878e00a458aa47703efc174f/xelefufesupaxurofewase.pdfIn PDF document text
    • http://skupka54.ru/upload/m/rimakuvaga.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/73465292127.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2nuagdhahrmh3ea4ep2k8ii7vn/bixamebonusoxevoko.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d87e91fb3---wovefexitobufasiw.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/budazubezazofi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5a17b91095368e5c4374eeebcd8ca180/mobufe.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/fakofolebudulupulira.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/67150955447.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/dejavesisixinefubetaneku.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/52630006248.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8519bfc1---runadugafidoxuzujewoxafuz.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/raxuxejekutiw.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/32585804352.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/35838166354.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xepajoluwuzudusoko.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100f017908fb---vodoloxexesoza.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/bekuripoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kinetic+typography+adobe+premiere+template+freePDF 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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 16352 bytes
SHA-256: 9b7341f5a40f79d00846f10ade1751079b469db7ee7e42ea56cdecb34e537195
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 11144 bytes
SHA-256: 4d82ba77875bb1a711739be981446b243c46af0d254f5715561f04305ae61ede
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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