Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2b1b4633c13e7f…

MALICIOUS

PDF

74.7 KB Created: 2021-06-28 17:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58d271e1094e2d5c1950ba6db509260a SHA-1: 95b3c4617266115cc3ea7232aa93d10c59934ff1 SHA-256: 6e2b1b4633c13e7f04787bc49aff32794566add09227579d101ec24c9c560b44
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c0eb1288195c0291311d6d64b6668f38/90781390247.pdf
    • http://wxjsyd.com/userfiles/files/vojekapaguzob.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc64fa454ad---10350627023.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5379d5c6535a10332a578c489ea5b6f2/migidija.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8c7d2d4a---wudilolatexefazodajavitir.pdf
    • https://kurek-rowery.pl/user_pict/file/7278778595.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/29892748302.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tq5350buigp583n0vdm9a2qnj1/80836646057.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6c7b552d0---61672237420.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095edf39638b---72271701932.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb32657001e---38684648760.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/272d5e7bafa7c2c7f9e7d1e1fd40408f/22458778636.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607177c12816f---nosarowupokofezibewaf.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c5c53dd923f770d30997fc20fcb55d12/ritutexefexeveje.pdf
    • http://aivieksteslaivas.lv/userfiles/file/gixitakodulopomikiruto.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e60978a1bd558481b5b40ab85f9e040d/10774891463.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3ej56v51ifgrq1svr597v6f933/dagubepeje.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/dff63179da77b474be4c678b99493bb3/49752262842.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609275e434744---wesewoviw.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bed3a527325567615bc34717f79f6eac/25558374766.pdf
    • https://zivotzaokny.eu/res/file/18070031264.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac10efa30---95193797196.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3d40ecba---jitiwurakomiwejufide.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37010e0ace---wetozilomejitejaxesabu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kikm0a3bu2jtae04qpu6vr6m8i/77361448322.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=old+guy+drawing
    • 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_off0000c577.bin
77cc3b166ff5a8822a963d96f88341dca201b9f9c376ff5597d3bc79768c604c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 10228 bytes
font_01_sfnt_off0000dc53.bin
7f5c23880615cc75983d535a1c242b93a5835241dc9afb61e64e3aff1962f560
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 16064 bytes
font_02_sfnt_off000105af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 16792 bytes