Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7a29678cab6ab4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 13:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58e0fadb73034b8e83ff50bad5408a42 SHA-1: a16a008cee8fee682fb10a163ab9805d0f88b678 SHA-256: bd7a29678cab6ab4dbe104e1f5d5eadac2e197ee1f94864cca4ae0b6e0543f84
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, designed to redirect users to malicious sites. The PDF structure and embedded URIs strongly indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=leo+luego+escribo+pdf PDF link annotation
    • http://maidichike.com/upload/files/92896565699.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/domeposilimo.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/72643478956.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210911114608.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/siladegulelakosidezamuped.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kabidizewokuziworamuzuwu.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/lewufavulatasasuvogefozu.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/5663397302.pdfIn PDF document text
    • https://dm288.rs/slicice/file/36639652337.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gozobolifenegimu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473151b1a47---womunegavama.pdfIn PDF document text
    • http://kalikraft.com/images/file/kupumafowa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tp29knfh8m48rv8s0n6i8r7ul97e2k74/norofefalijodafow.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/54664558656.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/17983356679.pdfIn PDF document text
    • https://masihpt2.com/contents/files/migexotufa.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/11134151284.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/dudajatitemuxawemivifawa.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/52042047821.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f689593501acd495ece6e60e4835ea9e/16908482645.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/3280769955.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kotupimolekijuwodigu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cfaafbb72935d61558c84b1f1db2409/turekimuxodadesikilawoda.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/fadiriziwegufinuwam.pdfIn PDF document text
    • 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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 20404 bytes
SHA-256: f7ac717679f6c12b1bcdb96b5c2b5a445dc44408f55b138b19f59626d862d45b
font_02_sfnt_off0001369c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369C 10628 bytes
SHA-256: bffe33980554cea1f988000d90619e8021c95a978760f0edc22f83a09b1ec91b