Malicious PDF — malware analysis report

Static analysis result for SHA-256 403884489b2c77df…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 19:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3dc3145ba45776d3d3def3da5b971c7 SHA-1: 1e1ce0be54905015e8bfc2a850ab6f554ba4310f SHA-256: 403884489b2c77dfd01e939cac700a50b3371b8638d1ccfbac3d6d633bb0bcda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://smidgel.ru/uplcv?utm_term=love+candy+book PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b24e998d9e3f099a290632778d096505/42832759003.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/98083044299.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/direfokivatuwomejizoluli.pdfIn PDF document text
    • http://weingut-suppan.at/files/vemolezudogawa.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c31558c75---witedotuzew.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9k5i36l08jjmbj266v8ek9feup/91638654177.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/17407670333.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/26195952754.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7d626ccda89926b83870c950fa8c8fe2/36365529930.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/17eba6d5d7929e33294236e731524045/rizizotipitemufelajev.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b4c499630dd58fcecc6c01e01c08bd78/4607144918.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/masevivimoji.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dofusotowakuxazaliwikas.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/sezeburorofizaditew.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/17f68ffd27f16106600ab704053388d4/doperixe.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/xajojesa.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/42230749603.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/83930648872.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f134100aa6---moxodadepiw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7ifh801iuuc8neeu4c3ankj26k/wavawemujivos.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13506fa7---43774606019.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 16132 bytes
SHA-256: 43ac470fcea589ff610178d7ee8b4eca3d7ebca5e1a90d9dbe30350601643f36
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 17644 bytes
SHA-256: 6b645ac1a655654b20682c4be080bbc50b3b6661eb73544d670daa7295bf07a2
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 10228 bytes
SHA-256: c42a1010749b5f4edfd521bb93c87ff95c860c7a781042affdd13c50f1998335
font_03_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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