Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8b21233807400b…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 00:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e93cf92947694231e53f1f131f3bacc SHA-1: 83202b32020d60c841053d41d07e251bf118d875 SHA-256: df8b21233807400b937d19981b6bb60d6742962c234f01eab8744af81f47531c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of numerous links and the nature of the hosting point towards an effort to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dcimx.com/files/fumolixifajulovobal.pdf
    • http://afghansolar.com/userfiles/file/wegenazakik.pdf
    • http://honda-vo.com/upload/file/40818934788.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5b3bbb48---48334125905.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e3566a1b---sozadaramituronixevigi.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3c954dc3ab484a1de611ff97dbdcc851/pafatekimax.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/47849c0589a614f04d3399a26ffd90ff/81672199229.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/84212427675.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e7e66f67---77073693212.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/992072733b0c116092fee68406c6924e/87514451794.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590a51994b---faretuge.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/43838029411.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/982d09ed02e8c6156000268cc0e2fd42/matidej.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fc46dbf5ef0093df7e147d428ef8c051/vojovedimew.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/95808c86b9a47693863a507adea44906/5017265794.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/70dc9a1e9446deed39e881531c01459f/29726735254.pdf
    • https://osiindia.org/ckfinder/userfiles/files/38727213669.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fcaae97a3---35745117698.pdf
    • https://meesens.be/KrMee/Tekstverwerker/81393656601.pdf
    • http://cukiernia.eu/upload/files/88014247851.pdf
    • http://botosani.ro/img/uploads/file/zegupomobitozob.pdf
    • http://bjjiffy.com/upload/37176641925.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+answer+to+today%27s+jumble
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 16792 bytes
font_01_sfnt_off0000fb6a.bin
f8cc28e1c9e23c3f2536d6cc06cc3c5c7517514b00cdbcb78f29a7297dd6a6b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 17344 bytes
font_02_sfnt_off000127f1.bin
f698191b82cc947d5318ec5e84affad8bf794e39a055e9812c0bd1fa5df96c73
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 11108 bytes