Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7c463104fd0008…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 13:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c00a9a0353454b38ac2c68d6827b2e8f SHA-1: 4bcc7960d65821a438b987848f63afaa2722191b SHA-256: 6a7c463104fd0008101e06346083b7935a796faa0df9c98027890c9561f331b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially for SEO manipulation or to spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=vario+w+grinder+manual
    • http://bekkercoon.ru/ckfinder/userfiles/files/kogumenidajos.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/74249171356.pdf
    • http://bigdoughpizza.com/uploads/files/puwiwo.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1b91cd4a---defifalufomozuderuvakule.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bdd7b5a6---81943812356.pdf
    • http://zerosquareonline.com/file/gixefefasakugeziluv.pdf
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/56225362110.pdf
    • http://dallaslandscapedesign.com/media/files/37072624322.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072214999fb7---6063038823.pdf
    • http://ampletrekking.com/userfiles/file/35204165436.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/bujimanobijaxajun.pdf
    • http://landia-print.com/pdir/file/sudal.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610039df640af---38889542298.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2042305af61351a803c895e636e1af02/loluwapevezezojomejax.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/53477185156.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52370ae271---44478545773.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff3c0c23db---kasiralufo.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/zuxuwipulaze.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8979ab577---rijatex.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f330106cd9---fexapikanulozuz.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/rebifeturizinubofitom.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9d484e3e86861a1a28e96b001635de75/xevixafuvofu.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_off0000bb6b.bin
ecb691bec82ceacf7cf354d256451c972614381dd77eb72e35bb6885b34ce27a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 10480 bytes
font_01_sfnt_off0000d301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 16792 bytes
font_02_sfnt_off0000eb13.bin
54a874420be852f1272b225c805828d51d50e0e23f6fa5fb9968522d289083e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 17064 bytes