Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf8b4df30f64537…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 20:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b900a9f556c4c94d6275331b4533b67 SHA-1: c0729f2db1761290ec3b4b9442c8716c9b6b6067 SHA-256: faf8b4df30f645374127190c133510db06c0767d0ff19e7ac598af6c64de2f95
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports its role in distributing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dallapietamarchisio.it/userfiles/files/78160950914.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3d17599b---datonozosajo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/22216315809.pdfIn PDF document text
    • http://saydersan.com/firma/files/gamubopefiva.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095a72eef831---pefaguviginuromar.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095af31b18f7---jibuxivelufobevuvawijakes.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5a6ea4c52aa0e5085eb45f57cdc18f89/labedujuzerika.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/39096612251.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/90550368801.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c841a2dc5---revelavesorigof.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/madif.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1ddbe47e---jipawadurinizobuwuzu.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/14112186246.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/28332162479.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/40291924663.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/besupagegufezokab.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/223le71nbrbfhs0qb1hmmi55i3/fikatubukorarafi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3uus107ss1mss0jisag0duss61/divakoxoxeponex.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/sevovikugudod.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/13276811168.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/54524913435.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/31644453690.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/warurujixen.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f7511010---6626804063.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7df223f78f5c483182d0b847bfc5bedf/takalibokivakokererikok.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b6c250095108b0b4aa543ebbd0602356/gadusuposinomid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=types+of+communication+in+project+management+pdfPDF 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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 17464 bytes
SHA-256: 0b43c9c33921857462b270a6746f3960cf937be1b2d27e6f1ef269ebeade4e44
font_01_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 11224 bytes
SHA-256: 638ae7181f57ecb453b384e63d6c1c6e147d5aecb65de0637edcec2e11f617d5

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