Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ee27c4de8eb16…

MALICIOUS

PDF

89.4 KB Created: 2021-08-01 14:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27e1bab1be72da1335d5ae4ed240ab7a SHA-1: e01167782466ec0dbf155e03193657475dab0245 SHA-256: 860ee27c4de8eb160a02d899aa97b2c8dd9284d0123569c13f0ea98d5fbcb947
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, but the presence of many external links strongly indicates a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://baschin-heizung.com/meineBilderAlbertGrundschule/file/jimolovugariwuredotalif.pdf In PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/soxitijaveti.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e69c48ed---ravaxavitedapijefetaxazub.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/sijerelelezefutunebejeta.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/57347279275.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lbirnrgs2fdju8pe719b6c9ck4/65532488196.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/57c65727f36d471d5d879e4e5cffdbe1/paromulobole.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427689afb---vesetubuvidajo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kagoronafoboburetesuroxop.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb98846148---wugodikomegusevopo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hi4bgm9l1mnt1vp61btbd6feer/14740287096.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/pepejuv.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lukesakewomarepukizitanox.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/85951072808.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026a2958da---36747606473.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/u3isiac85ur3d55m1893q23gs2/waloruno.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/97225224396.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfd018edb---23079531260.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4c5d16876e2870a7952edb8b35b1f684/fewox.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/16403658cc13026e66de47649a1eed64/35335415503.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/fosajonawekosupitili.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/tapagutezadabexupiga.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/dabuliwizevivejejiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sujet+bts+eco+droit+2014PDF 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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 19312 bytes
SHA-256: 8bdd4b9c741a08be69302359957466366d550bfa55458aad4bff7b8cd7e6393e
font_01_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10868 bytes
SHA-256: 3e3c98849e6bd134a9f1c667d70967a2e1c40f7eb09f0966d559ff028007c968
font_02_sfnt_off00013d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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