Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5f08e1959be7c9…

MALICIOUS

PDF

90.4 KB Created: 2021-08-10 15:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63717796f69cd2e9d4f8f4c3c239802e SHA-1: 7b303c1c16e914fc384b4f47ac10d756a1faef91 SHA-256: 0f5f08e1959be7c9659faef7cea9d792e23c29e9551fe24ba7815458269b2e21
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF was flagged by multiple heuristics, including ML classification and a specific rule for MFA/one-time-code harvesting lures. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to steal credentials or session tokens. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://piotrkowska77.pl/zdjeciafile/75238071898.pdf In PDF document text
    • http://congtrinhnhaviet.vn/upload/files/kawufetokop.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wisagudanelenegifafokefod.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b89601a5337---lajulitokazolarapi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080225d98e77---98007138616.pdfIn PDF document text
    • http://zzweien.com/d/files/walimoruzelexuzanonugu.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/64973853727.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9n5t87agpov1svk8496rcsrp3f/9090046866.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba167ee71d8---pifesowozenomipeduzojewun.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/xunipijij.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ouc1km4ql67bt8s4f1vsh23lp3/99337561932.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/dimines.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc7e2e556---99381314508.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9h0gcha26jr93gbjgrcspsspt6/43965756721.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/2c5lq8obqeqnak9un7arh1skr6/jilubezipek.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/66803837501.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gefosakuz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ghan2ip234e6oj6n01hnsa99at/desel.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/59232317782.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2jq9icro4lk362nf9dp2e1tt23/7034174201.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/91650056176.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/zaxupojatifiwofubovijud.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0af0cbe4d---vemipuxopufeferikitof.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d87736600---pubam.pdfIn PDF document text
    • http://greenld.com/userfiles/71361063661.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/65827870355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pro+tools+authorization+codePDF 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_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10628 bytes
SHA-256: e42f27a8b4570647e6e63b3e94d09b441be89defa61da877bb18797f5b314c8b
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 17104 bytes
SHA-256: 8967047e190d4704fc47e9145ae2a955632ebb70bf24b0ba89637fdd66a15b12

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