Malicious PDF — malware analysis report

Static analysis result for SHA-256 32228435a3a78a27…

MALICIOUS

PDF

186.1 KB Created: 2021-09-05 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 722c78d7c6cd3d23ac8b156c1ff94e13 SHA-1: 50d9b6cbc5f3eef242547bc7a0a0cbcae8bd9124 SHA-256: 32228435a3a78a278619b66fc90aa0ba4b7bf533397d11310c01dffb1e20391c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=determinantes+ambientales+de+la+salud+pdf PDF link annotation
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf098494b3---lipelizupakoriv.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d35491a5---31994339922.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63246e554---41453384429.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/312ka7smnpodhk6k7htcb0o8r7/15535959673.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8509844600907688a7b66fba84d82c5f/73093360635.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608100ed87f60---zajonerub.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210726_202242.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3108bc4d91---gaxaneb.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/70888928811.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/waxenajowud.pdfIn PDF document text
    • http://kasargod.net/uploads/file/53235746035.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nefelifokukonuxapen.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/59103580966.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/24380859810.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/81273263617.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160853562efde6---64102042179.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/12859893836108e6e71e382.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/risezo.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/davopajisejevelekusaduwa.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sepobojobazuwogomisura.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/lorido.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/50295385626.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/80577923078.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/57481980989.pdfIn PDF document text
    • 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_off0002760f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2760F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E21 19912 bytes
SHA-256: 391bd3fa95872636a21b7b5ae508a7d2b0aa061a64d1ab4457bc4e57722d4321
font_02_sfnt_off0002c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C0FC 10780 bytes
SHA-256: 59ccb023da2a1420d6f3414e2118e962880cd87f2130d0a3d2e760ec0f0ab6bf

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