Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b8ad82be9a4e35…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 23:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bc7d6e3f9b928dbce0e2bc9e66f565e SHA-1: 3e28aa8af13963a7649cbf9d1aeb4ef551a547ab SHA-256: 61b8ad82be9a4e35c7b51b742a4388c9012fce479c02da47c80a81b386c45ed3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160887e355b814---89101896110.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9dee76492a937589f6c9dd3fc3f8a13f/12481998497.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/29970451776.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4b24b6834d90d7ecfadf09156dab4921/52099567821.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/32139161504.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/koloraxusu.pdfIn PDF document text
    • http://demo-calson.garment-pro.com/ckfinder/userfiles/files/verojewaxikinanozob.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/lenomojudi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1b7c55f6e7bac93f3e1857bc2fdd6976/73495759108.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/943k95hkdusv6dd29bjdm80go7/sanemopavikadetemudo.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/wegopajoputobevepemexi.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/nabitasawaki.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/gusifowumuwaxep.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/toxima.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/nonuz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361dbb5079---kefiwipakabu.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/44546308822.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a5b49dc0d26b3c980854a296929bf2fb/modafowalarobavedamufe.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6a6a6106---totadijudanerabopuwetixo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/67641373576.pdfIn PDF document text
    • http://berbun.com/user_img/file/12554225325.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e9472cb8b---11915582565.pdfIn PDF document text
    • http://kyea.org/imageuploads/62808553614.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb1cd5e307---57697478737.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nisawizodak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=assets+and+liabilities+definition+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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 17620 bytes
SHA-256: fe8511831b32cae601f965b288ab43717b94c88cef191154630dc1fe96d7c963
font_02_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 10512 bytes
SHA-256: f7a988bb2ac9ec74f420083afba5342d4360a2544d6e58d9b376b6c4c193f5d9