Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce5d09dbe7f3027…

MALICIOUS

PDF

89.3 KB Created: 2021-07-25 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f100327e77218cb7d3578f1766cc5aa8 SHA-1: cdfd2d23ef3aa450d8ff98de9d2612f1873e21af SHA-256: 9ce5d09dbe7f3027776a88327eb37cfbf9bb2263edbc0041474dee7fa5f1a773
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The heuristic 'SE_INVOICE_LURE' suggests a pretext of a payment or invoice, which, combined with the link farm, indicates a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735be3be0eb---81776804685.pdf In PDF document text
    • https://rotherelectric.com/files/31340093277.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/wisoluzelozadetitelu.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/pofezavemo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2536875dd4---14335049855.pdfIn PDF document text
    • http://canvangdientu.com/images/file/38238882867.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc8810399---53510311665.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/03a0a72ed00974ecaff31c0883d4a401/xepujisupupegusura.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55d7d877b---xibelanozokuzaxi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/supixovulujut.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668bc990b5---76283033393.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/petomarezan.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/78ed62f6124315d8683b8f4c4edac098/betadegojajojodisojeg.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/83661163429.pdfIn PDF document text
    • https://auto826.com/uploads/files/majurofezas.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/81478696629.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/37365628625.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21ff0da36---vebolerulidabenazatuv.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/089f6ddb7113f356ac3b97fa0ab8dfbd/98634627880.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2c7e330438b93428e43539345fc61e21/88223584731.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4878146564.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/tutedelubivakoja.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2cc57511---94917262902.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/33196920208.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/68243931713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=debt+repayment+agreement+template+ukPDF 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_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 17364 bytes
SHA-256: d505095c6bf773cad75d46fd755b32401e552f21e87e561ee3f20ffff207f931
font_02_sfnt_off00013e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6A 10664 bytes
SHA-256: ab54156ad4202b2646dcd0fcaeeaacd84b76227dfd5a73305f4e887827631c7b

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