Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5b8b263d53b824…

MALICIOUS

PDF

94.5 KB Created: 2021-07-02 12:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0735b86ce0d5accabaffaad43c509419 SHA-1: 91cc4f1cc42d01833ddd486b259a3cc559829878 SHA-256: df5b8b263d53b82415f8c78247f0f986f0b7504ccfc6a05afc1ce951c3f79687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160713c2de6e7f---70646260567.pdf In PDF document text
    • https://orangerun.re/photo/files/17985059490.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cd5c7a37---ginugovotovusujakefeli.pdfIn PDF document text
    • https://123natura.com/stockages/files/gemapiki.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/721f0ca6e4fc9d8c353e0b1d1d6d10f6/26738062941.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44b313dbb---41524888036.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b663ffbc2e260ec3027bd71431db3066/75380895501.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088abf5c67d6---17768057229.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/aa434291f7fa65569c2221628d501cab/88247505602.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bamugavozavuturiviwote.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada201794a---4774519967.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/67605639795.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8f3afded---98696908402.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g8fl19ckjjgoqs73f1n8b87ekd/mofumavozap.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f47ce84550ef13d25f53d50b76a6fdeb/mosegexa.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc755473bc---gumibizuvasojaxu.pdfIn PDF document text
    • http://scpt.it/userfiles/files/sewadisiludupav.pdfIn PDF document text
    • https://bhavalaya.org/ckfinder/userfiles/files/83974893736.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/27313565088.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0c3149b9---pojibusexojadatuzipafoti.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/sexufuno.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054b5c05b1---ladivekasosukakudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stone+cold+shelter+characterizationPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 10604 bytes
SHA-256: 141e9d925c4ebcead5ed780f9abad9b4331c00e16bd604d0d3451cb059d0c21d
font_02_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 17216 bytes
SHA-256: d7e8a1c63f7796ac21e019b30f651a44c6dc893145b155c257cbda6d8749999c

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