Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb840961b7725554…

MALICIOUS

PDF

97.6 KB Created: 2021-07-14 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f87d5914d9d2e1464a1105a43401b363 SHA-1: 1a1a1b0a04a9f1356f9095f8f099cb5e4012de2e SHA-256: cb840961b7725554b28c1e5626399b2979f4020a0c17f704f7da0353bccc1c14
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 https://krisoc.ru/uplcv?utm_term=what+is+a+drake PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1ba19e683fb690eba3f3352ae6cd69c2/derufojuvimajub.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/76285625164.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/18e91e22b60c06486eff3e5307b5425d/vixonazunizake.pdfIn PDF document text
    • http://mp-journal.com/media/file/penupoli.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/80011034997.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/bazoxaxelusiwujuti.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bf93f87c555a5947f5321cc86f6e507b/vejevebepizomunekis.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/065c90cefaf6b105eb6f76bc717c404a/tipaxilowu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfd267fb5---xegisipekedimodopifopi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oqa464btutoclj0r5uaa6f357b/15528357647.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/woxizogovemijux.pdfIn PDF document text
    • http://centronegozi.com/public/15386974645.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20cf42540---ruluvirovo.pdfIn PDF document text
    • https://hoalavender.net/upload/files/73303970913.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vodavixejugekodo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/34734327787.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/zifekej.pdfIn PDF document text
    • http://springbook.no/files/gojowodekixuv.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/2267491701.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mowubuxot.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2eaa05fb1f7e41a037500ba59f095280/9266675094.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084dae185e88---sulemumiseguxusoxusamobe.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 10160 bytes
SHA-256: 8cb12ef8059b8a2438071dd93ddcd35039c9a42375f6b91925f7a9a5c4b41363
font_02_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 23104 bytes
SHA-256: 15ed25aae33e26443dd0709dfb2c2db2d0f5bfa436a7eade3d53fd22aa8c8287
font_03_sfnt_off00014c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7B 19280 bytes
SHA-256: 22ff94c9189742fcf0222178c8f6a92df0d828e42484e5ed98d872bde82396f3
font_04_sfnt_off00016c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C10 2600 bytes
SHA-256: be6910c38976f437b2d32f7c48f51cd336278da00e9b832f1884305538e3d365

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