Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5354b48fbe1312e…

MALICIOUS

PDF

76.5 KB Created: 2021-06-29 09:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccf7938b78e1aefac9387126169ee4c8 SHA-1: 7dba96e5f32dade5b7f592ace991ab481e4896ac SHA-256: f5354b48fbe1312e1959d950a22ba46d55b9317d54eee712e525c9fce5343c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087af4e52361---wezejozomerusufaxotixizix.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6355bfc487301e50581e8ad18d82b871/87611551967.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8e6fff4a3c973f80e0e84ec3c530131c/komenanizujisab.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2ecf119e5b095a5226c78b10a0be3abf/85614877857.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d20fbf87a---66583124008.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608452f59704d---sijemazefofesigawumu.pdf
    • http://whatdwellswithin.com/file/57447219216.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c86b590c3---65545705401.pdf
    • https://aawyx.com/sites/default/imageuser/file/72388226833.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/190832153054c491f0d492361f4bb699/98134102205.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d06cba46bd60d57052777f8d5875c3d4/venatugakumonowunebamoxij.pdf
    • https://aimhc.com/userfiles/file/kopodunusupagonuxaredeme.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rm6lok4veot8e8ulbq8nklm2o9/43887450241.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605dfaa568---vugogenidamiweduxag.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f3b76b2ea543a2f0295ca68036f2d96d/30691159820.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/58425956500.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/xapazodujonovaxavajomis.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/00laf7h1qdm6b4gpflnga6ks5b/90516476513.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tommy%27s+tap+house
    • 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_off0000c562.bin
9581f0d53d25215fc22e8ff18c7e2f7d6363ae279e9a0127dd44365b435e6811
pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 10388 bytes
font_01_sfnt_off0000dd0e.bin
b18dc786471646d6b230acc2356586bc2d341effbc2deaf8a6c5ca14f2f8eefc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 18000 bytes
font_02_sfnt_off00010bcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 16792 bytes