Malicious PDF — malware analysis report

Static analysis result for SHA-256 395df6c4be8fcae6…

MALICIOUS

PDF

94.4 KB Created: 2021-07-31 23:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0c7214f2af2de8df27ed9d3b5b2695f2 SHA-1: 33b55883558ac04448722a406bca998583121d73 SHA-256: 395df6c4be8fcae6db6c14e5916b9cadbc05065f1968a07c3f6f0e47e45a8655
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 upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of external URIs and compromised CMS links suggests an attempt to leverage potentially malicious or compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://morard-mcf.fr/data/Files/82223545920.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/nononimudojubamamaxepotup.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/51132187059.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/98beb58de76eeaa41e7c9b3ed267d287/kamejakoxerugivas.pdfIn PDF document text
    • http://falerisztika.hu/tmp/bunaxabenevuxejome.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/50910657836.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/70736a0dc6d96f25192d1f6b88e029ee/44265774017.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9bq37p4e9d3tl8ed3h298a3lls/15516603621.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/78212258110.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/59634786258.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gazuxaxumikotot.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/95536245961.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/dugojibipufuxigokexopino.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/xisapazitunususeluju.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6s9f8acfuktnb1u3h83po9ji6l/xodemukilovu.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdba3e705---67427281142.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096092acc629---buwaxubuwokije.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/22741688646.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/dd77ad89e2ed74b8ac874453128ebc6e/pivogudikuwi.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/vexipisifilikarit.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e38cc520---lejuwaposimevapu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21cb01c7d---xosofezopexudu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b9bc9856d74e0b31cdee7105c99def51/47765419278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=compound+sentences+exercises+grade+6PDF 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_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 11212 bytes
SHA-256: 22fb854effb2af022db01f537cc1157291079624877529d4446714c4a5ac8d3b
font_01_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 16840 bytes
SHA-256: 11c090be0eba980c07ca1806421cd4099bb5df8a42f3b097123632c51ab09251
font_02_sfnt_off0001531e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1