Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f276edafe29c722…

MALICIOUS

PDF

69.6 KB Created: 2021-09-02 13:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a57dbe29b43af370bbb60c0f7ceb73d SHA-1: 6c574bd27b61ea752522d5ffecb8259cbaa93d2d SHA-256: 1f276edafe29c722a73e0c5a53bc44dda4afb594835f35cde2efebc60598b8db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action trigger. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cornucopiafrederick.com/uploads/files/80434808936.pdf In PDF document text
    • http://archpiudue.com/userfiles/files/rixuv.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/juzagapuvune.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102bf303bb80---46168678066.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/64067630729.pdfIn PDF document text
    • https://flyags.com/editorResources/file///45679353105.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4da4c2f0f---fapisujuwubizewudizulug.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/jawajitopug.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/zasojuzowokizigoforu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/99579583925.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6332db339---21321582862.pdfPDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae1b279cb1---wewuwivenar.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d50e47924---dulunasofalusipini.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/088604530780923e5bf4694d10ea018c/kewudisowitizif.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/49309306123.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bfdn5gfgc0tt0e5o34qs6qo3a4/37906280698.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/14696039141.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b620db5c1---707139658.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5r5tan88ktcms1daehg60ll0e5/16086978716.pdfIn PDF document text
    • http://cpviettin.com/upload/files/mexisirokobuvo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/kijebiweruwegolulawel.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/90236037811.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fuxogizovogene.pdfIn PDF document text
    • http://guowangcable.com/d/files/19122826007.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gemebonup.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/faretobukifexakuxusixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=que+son+los+antibioticos+betalactamicos+pdfPDF 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_off0000b344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB344 10980 bytes
SHA-256: 4ebe5f6ab159aa53890ef54225f626a682b1807dec6f214f0754a98e182e2900
font_01_sfnt_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 14020 bytes
SHA-256: e53e0202077b81ce4a89695b4ba9d3e822c8fc3887a5adf24e9c206020558f0e
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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