Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b269ca14b07fd41…

MALICIOUS

PDF

93.0 KB Created: 2021-09-08 08:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc831bf2e9cdd5dc59eb891dffc1171 SHA-1: 6c9406bf72e8a042315cb3a44204416ab12383ce SHA-256: 2b269ca14b07fd4186910b87340ebe3b012b957a31c05f2f9ab0b4430ccc91c2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c29677a0b48---25088442842.pdf In PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/21332425315.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xiludonorodagag.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2de309faed58124b7351b1ac09d52b04/6628059382.pdfIn PDF document text
    • http://coumert.com/images/file/80899434674.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/daseliresesemewupo.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/41714076962.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/27af118436e85ae97d29deef02707a33/57793839561.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/guxorafoxutamamuxonixerem.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rulunuranup.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/60483747853.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/kobawi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/63264359720.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/4062446503.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2b771a3b3db40078a908ac56a85fe5f4/67834220255.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/7476830642.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fufabe.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/42685755976.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/rasiludewapobogamarujifo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2k48r7b5an5ujmlvmeaeb2l474/6114215955.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc90dddf51---1091797897.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090379791898---bobegadig.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/rituzinodasalojofola.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/11858799963.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/892rdvb1h89v47k8ee12otup69/vaxelokovixevafikenu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/xexilefupat.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/95840561718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=guerrilla+warfare+book+in+telugu+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_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 18084 bytes
SHA-256: 3f1c87e782bcf6e4d1991d2960db785381a3a5587665fdbb365517a451d845d9
font_02_sfnt_off00014cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB2 10960 bytes
SHA-256: e7d2d10704cbdc1fb21bd099c2231fce85b95d003813d1ad21c6466f15891b9b