Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3ba4b598f7142f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 13:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c93a6df51114fcb44b540f28bfcecfd SHA-1: 14d873ae8753e2aea15fde4c34c2f1d3c93736d8 SHA-256: 9a3ba4b598f7142faa7ddbadb714416471081cf9213eac1247b329eb4112e6b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or compromised CMS upload storage, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://himalayakebab.irafbrothers.com/shipinc/userfiles/files/43904967832.pdf In PDF document text
    • http://srilakshmienterprises.net/uploads/10463827728.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/86120538127.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/nexiruwavezakunutezofe.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/48438384610.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/11350969833.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/jolagowajab.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba3bfad7ee---tulavivi.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85626413086.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/loxato.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3bf55524fefffe1fff3ac3f51eaced6/2548390072.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tojetinefiliwisaxowov.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161378519255e2---kewibuvoriwelusomav.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/pemisulerunaweruruk.pdfIn PDF document text
    • https://basisangka.com/contents/files/pafaxuj.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/68761881748.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161515dc60517e---pegibaberujuzifowejesir.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/s9v7ak36udhk3j1d9pldgjsnqj/3665962256.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/32170083821.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/gefefinabi.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lubatudu.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/19355360533.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/94886709998.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/64174741728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=generator+free+skinPDF 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_off0000b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 18004 bytes
SHA-256: d13a86c8f5bec7293be6b66c06fb3c57e1ebdedd0b4646ef1d603f04acdf7e2a
font_02_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 10292 bytes
SHA-256: 6cfee3e3489ff277119c866b5a3085f771dce96261ef2a6fbecaf722112235ce