Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fa0d4d94d8ba95…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 10:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22b154b5b9373ee08947c00a535250cd SHA-1: bdcb75f4e9cf6f512d36342c2a7db5ebd07d97a4 SHA-256: c2fa0d4d94d8ba95ffdb7836b55f71284c3b6f55660e72a1f8856ad8931e71b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms or potentially compromised CMS upload locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://stalbeckers.nl/userfiles/image/file/2425062819.pdf In PDF document text
    • https://butchercurnow.com/img/shop/contents/kuvinagosujemame.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/kidenafuteja.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/lagitusisonabup.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/77397859754.pdfIn PDF document text
    • http://strap.sk/uploads/file/tisazedurut.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/molepafudewax.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fodepunaj.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/sogon.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jurenikozijifezebufevapud.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/pewifirobexit.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_33_08_1794.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/lazurimoj.pdfIn PDF document text
    • https://kueapem.com/contents/files/lotumoziladiwukixulaxo.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210910201653.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/98753058831.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/df8e6e17502833bee8d23f963048f27d/sujogubabem.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/daradil.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dinegukamovugebofejamive.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142981f33352---durabipufipon.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bd74e5f9afd8706c2db85aac4521c74/kizufativilixuzoveji.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/vevililapofimebi.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/vawanowiluf.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/54434590288.pdfIn PDF document text
    • https://invision.buzyhub.com/files/70198989547.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/33984681510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vid+to+mp3+androidPDF 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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 15664 bytes
SHA-256: 86aa09376f18e541f5c0cceab2cffde439a5d8bffcaba8e8ef38548b7b316ac6
font_01_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 10348 bytes
SHA-256: 37c0c7f0cc641b5252e7829fe84355bc2ed24173e04db67042f409592ac62766