Malicious PDF — malware analysis report

Static analysis result for SHA-256 feeec579e6ceffeb…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 13:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a93d8cfaf2f26d5040e065910fcb28c4 SHA-1: d7d8114ab745f663c87fe7ff500116a269ce9261 SHA-256: feeec579e6ceffebab509ccdb2a658aeb8a95df39d2b37aae53995299e6d4393
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fc-junajted.com/upload/datoteke/5350097316.pdf In PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///75703427142.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/dolefesazefolagolo.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/lurumexumoja.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/lutuvaradejakekozapalulal.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/teginolatumuladuvipigazux.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/gakunanelogixidoba.pdfIn PDF document text
    • http://budka39.ru/files/62679839906.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/32797713277.pdfIn PDF document text
    • https://beaszemin.com/files/69720509440.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363d02e1776---ruxowarolebe.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b1ca6507259794a7d56f3a822c1a8f0/41254238886.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a70528b9b---44087869092.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/8436597653.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sekozagaxafezukaxuwowato.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/76938574625.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/14840508282.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/37191226683.pdfIn PDF document text
    • http://thegioioto.store/upload/files/58150995010.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d9e7dc700e3218acbeeecce4430d3582/madutinufetolalevi.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wezofurexaw.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/juvasexadiw.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/tuxeropazixin.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/80249314637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=k+means+clustering+dataPDF 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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 10684 bytes
SHA-256: a30ef5298928b07a997aa92adaa18d848de65af47db54f42580fc8aacfba033c
font_02_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 17884 bytes
SHA-256: 9867b907462232d22527f7d56e2d73c247f89edfd7b4a2d092ac19fbc7b108fb