Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bf0e064e11ba9b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 05:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1aa363bff99568d356553a78cfd53234 SHA-1: 336ce04531f1f5862f25ad017ebdc327a2b7fe5f SHA-256: 29bf0e064e11ba9beeae9b90ceab42444bf73bc03ab3fa0c9ddbd97bec8f9d86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=ratio+word+problems+worksheet+grade+6 PDF link annotation
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vimigaxujukizalejivulowa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zitoxulodevutu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/66f41eee3418a6b7f4621af9f8da4883/fevunofeg.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/29295082924.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be40388993---gagukobopuxetasezaxanafez.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/vapewajibuvuwake.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/561584b1f09895f386175a8e8261e022/1718773103.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gumomanebilalu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/gufekuvekekabi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/00c1e4036b4a712f78d49a99206a5603/tazelenovekaparawabufapu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/62089073409.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ef2c089e8e6b8e64e38d513a1ef4ffcb/pagepizak.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d56b127c97402c4b2120a50df8d234c0/tapizisolopezi.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/14141189128.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e6f987899a5a33ab0cc5175e5af47369/zozilepimoj.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/26080296442.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4c0d4a40ecb9a8b86d250866d18afb81/95671926062.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/36279583867.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kewuzibojuza.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0130ef697c366d389eee024cbea9c35b/sifanot.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/47760082272.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae6ce8cc7---59983133242.pdfIn PDF document text
    • http://mextro.de/upload/files/9776321030.pdfIn PDF document text
    • http://samtekelektrik.com/files/jubak.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/sipalen.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/24286770334.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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 11268 bytes
SHA-256: 5bb7cd250c3fac2a2b05556dcc2273de68ca8cb412fcd0802a0362388e510a1c
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 18432 bytes
SHA-256: 61ccfce0ba86a66834206997145f0f72e0b680dbc9a8a3ecbd70cd4ec6f97aba
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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