Malicious PDF — malware analysis report

Static analysis result for SHA-256 949c6fbd27833c3d…

MALICIOUS

PDF

96.8 KB Created: 2021-07-18 18:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1563a68639a7f02f70e19dfe85e7e29c SHA-1: 81893faeecfe8b3b8ab2ae6f18cd0b8f52378bf7 SHA-256: 949c6fbd27833c3d240ce336c2d666c55daef90d0e4e9bf63add232dbecf8dbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://yomamasushitogo.com/uploads/files/39607966114.pdf
    • https://eccdc.org/application/webroot/userfiles/file/96876249127.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/713dd3ee31dc1f3f5f6d4da3c08edf57/90286591581.pdf
    • https://colakcivi.com/userfiles/file/petidubotokegitor.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e76o83tuqufoddb1hbk5ccgfh1/71541990258.pdf
    • http://siripanyalamphun.com/user_img/files/kazejoforajiwowoluzota.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ccb3c78b7fbbb1ec07c53540e31a433e/naguzeluvexukezuregopo.pdf
    • http://brette-animation.com/userfiles/file/68713297913.pdf
    • http://kleiberit.ru/files/file/bazefuxire.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019f1a6396---bisozapapoti.pdf
    • http://aire-limpio.com/img/editor/file/fonedeniwikazire.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef71043b4---vebotiluvipesejinanogulow.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bd857113dcb5859ec1ccbad5bf1f27ef/joliberekirorudul.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa31480f4f---84390040245.pdf
    • https://girilawfirm.com/content_files/files/jemibimafiwezasusupivivok.pdf
    • http://aggengr.com/uploads/CMS/file/vesofuwonuku.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fuwot.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b028f82735---tibaxelolaxerabevozep.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087593bbe478---19857481192.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ccf5eb5a144f6c1866cd8e264264ab7/7737986566.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/g3jpsejtsuubv3cqkdicost907/kudomaborevepubevasa.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd4425342---26684525593.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+straight+a+conspiracy+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119c7.bin
4eac740a7fe51221fcc05831dfe2df8c8bfb8fc921987d983ce5fd84e9e809b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10932 bytes
font_01_sfnt_off000132e7.bin
aaa4e15997a43ffd3dd2186b7c1e6a4871525959fb7a7add8e5b0731b3e96b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 16548 bytes
font_02_sfnt_off00015e0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0B 16792 bytes