Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1b2aa68ece6318…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 18:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ec8c32f6a9e491d094e4108e4917568 SHA-1: cbace0cdb1785b1b6016b7e1c32dc411f27fcea7 SHA-256: 8f1b2aa68ece6318bbf6c40c54e294316e33214e21756be00667b66c15cf848f
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/14572856606.pdf
    • http://laduses.nl/image/file/xuwulolusaterike.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/45570086782.pdf
    • http://superplasticizer.cn/d/files/60116239368.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/12269053467.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece00c7ffe---59144572269.pdf
    • https://bravo-hk.com/userfiles/file/6615170137.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/82682226182.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/i435h4c2dvdko9p0bgpon99g9c/kaveweraw.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/o8hgjqng08navdetvs2svd57jk/99907307764.pdf
    • https://chp-travel.ir/data/file/49722904916.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858dfaa5bf---56770150756.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d71769a7---tozuruxotufekipefekago.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/06e09dc6ba506f17b9b19be6a3d63a5a/deguniral.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf75b4f5---91522989798.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc35a01f19---86733232338.pdf
    • https://ezastupitelstvo.sk/editor_uploads/system/files/pudaratonalofinipi.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364a431b39---punomiluretu.pdf
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/89532325009.pdf
    • https://service-panev.com/userfiles/dewuzewevuravixonud.pdf
    • https://ajitcoatings.com/uploads/tezirelami.pdf
    • https://najarshi.com/basefile/najarshicom/files/21653841835.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d50ed87ed460bdf9bf54c21087c09211/gepowakusi.pdf
    • https://loctra.net/userfiles/file/juvupifekalajusuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=after+2+anna+todd+pdf+portugues
    • 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_off0000bb6a.bin
7aa49b7dd4b90e80eaceb88ac1b7a5fcca3cdb7441f0fb1b97d3b2529cdfdedc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 10736 bytes
font_01_sfnt_off0000d41c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 16792 bytes
font_02_sfnt_off0000ec2e.bin
d5b416353d668e0db4683afd6813663f34e61ce198216342a8f7639db7092185
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 17824 bytes