Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4326b7b3737a662…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 21:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 979899a1e7d1ea7e517d025abe3fffb9 SHA-1: 3a0f88c3bba92232f68d8c20678a345610812b0e SHA-256: f4326b7b3737a662cdaf70a50c8d2fddd09e8234ca84777a65c5b9771d927698
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and numerous links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://anhbanglaw.com/userfiles/file/mutidepekikel.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/791qmrlvahrhhensamua9dgja5/38871366268.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3033e306f0---73403619345.pdfIn PDF document text
    • http://askort.pl/Upload/file/wumexotozolativuxovog.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfa36d268---koxuxexetosivilow.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/segogomoxojojeforela.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b183f1b5fb3---4234118278.pdfIn PDF document text
    • http://beta-rc.com/upload/files/lizudemijuturekixot.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a723aa8d7---xabopiwitatusosad.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/6834542063.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/piwolebadelitero.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/kpp63t9vd2a0bon6hnjgvhtb72/37406373131.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1fddbebc36---8019800748.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040c31ce9d4---92244675328.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0429cad10fd9e74b30019bac4daf355e/tuwilononivarenasonubif.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/11779593444.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b992b79677d6a778c103a13461fd0ccd/88841198349.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25f8a6081---71333220719.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/puxezovaroligitex.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7gkme05ufpgq3e2mr82e6g99e3/dofosoxuregivitafonuwajok.pdfIn PDF document text
    • http://orlickachata.cz/files/files/76266519924.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/21934281659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=graphing+motion+worksheet+middle+schoolPDF 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 11180 bytes
SHA-256: 9d2abaa973b9626d17f96e42fe32ee446f79d977b5c4126c18b4045b9e338d6f
font_01_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 18016 bytes
SHA-256: 09f746728ac399650133cc01eb6185f0b0a2168fa4b16bc990fe98fe32cdbe04

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