Malicious PDF — malware analysis report

Static analysis result for SHA-256 789ae413eb48bdfb…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 20:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 573f590ab653e771709f2b5e3b8f87a5 SHA-1: 9c01807ec17e2ef0195f710ad28841ce61975dd7 SHA-256: 789ae413eb48bdfba3ff0a6f2055c2a539331b043000440c5bb1ba0dba468624
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential phishing lure by impersonating UPS. It contains numerous links to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicate a likely multi-stage attack involving password-protected archives or direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+open+screen+lock+if+forgot+pattern.
  • 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://nuestratierrapremios.com/campannas/file/mogaxarazode.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cc151ceb---50865938124.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/73831367858.pdfIn PDF document text
    • http://briztravel.com/upload/files/74014004958.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/domaga.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dffa02bd3b---98416788183.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/ribuwozogeribebotuwola.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/33908366637.pdfIn PDF document text
    • http://wdnederland.nl/file/48933801670.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/bapepile.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/sejipetizujiso.pdfIn PDF document text
    • https://purefeeling8.com/data/file/18997584399.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/62474875445.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/rimunapi.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6135AB2B1F356.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ft019r3659cq2f452kb1k4be55/zuwenuvotubavef.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde6e2c98---vojekelatedox.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136466163a45---zaxazojububuriru.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/48150810985.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/57634623672.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/19000149320.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370c7bcd134---45289601798.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110944497928.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/mebepujifuridevor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+open+screen+lock+if+forgot+patternPDF 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_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 10824 bytes
SHA-256: 248cedb5b0cabd34427fad4c80683655864ad50f87bdbbb1ea3c613b312c3bd7
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 19776 bytes
SHA-256: 985e6404bac9ca3e74484f8b789ecac1a17cf7b017602e2a7cace6d80fa770af

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