Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27a33db692d4536…

MALICIOUS

PDF

86.9 KB Created: 2021-09-03 15:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d1dc1339fc68c645cb060847981b27d SHA-1: c79a872ed2b1a34458e46f8b956019820c160d85 SHA-256: c27a33db692d4536bd5a68ec73d4e86dab50acc711130407e1cf7bd728e9d9cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://conomiya.com/images/uploadedimages/file/59348419410.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b6d909dc---kubelewoze.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/zujulodorales.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/dajaruxovuxelinigubes.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af916d7fbd0---87211513467.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vvu24tfad7btgciir68a9gkqu0/tijamagerokub.pdfIn PDF document text
    • https://areicon.com/images/file/lezezaru.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c8970702f062b30c3a8d97aad5a4062/xebejewuzif.pdfIn PDF document text
    • https://bataretak.com/img/files/file/baxitisa.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/ritomufimubawifosivasit.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/tulumejusulelafexonaze.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/30023180504.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/tikezovojuwikimamo.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/98212684525.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/pupakazumewelete.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cf6e28c7---fotanewepuluvukizuz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896dff7ad77---63356088372.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5728f2333---93057003070.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/luriwuwex.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/678c33f84e0d88cc29c062bcbfd5418d/vaxemibozuzonobodil.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2bdcbbc99451e327e3bc6cc86bfcd6b7/gilijisafevuzor.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/vakosanamojovuwu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f0b2210a25001ba7650936feecee4d15/navuvijojipebedilixukadol.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/revejovobonujumepazi.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/mowuwalubevojitatopapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=editor+de+pdf+online+pdfescapePDF link annotation
    • 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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 18584 bytes
SHA-256: d478066789af1d0d7a7f3fc242a95b8562353204f70f279a55649357c9da969b
font_01_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10596 bytes
SHA-256: 3383749819d8b91682872bd0eb5c7b9b2411dabbfc8d40c7106344cb2b00fab7
font_02_sfnt_off00013588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1