Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f4a84fb3476b4…

MALICIOUS

PDF

73.8 KB Created: 2021-07-04 07:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b2bce3296f86afb8a46eeff58e81b92 SHA-1: ba306be42d5429a1d6fb415105024df16c7df6a4 SHA-256: eb7f4a84fb3476b4bc6c40a1ec94aaedd5af96e3375f18730969e4dfdac89490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://kibbkw.com/uploads/file/86702679981.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/86716f60835d1512ab03b374bac9c04e/39549831360.pdf
    • https://cplastik.cz/data/cms/file/ravaketoweni.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92db1f8a7---wezul.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/a03u936muiks33nhktes7ngq12/jibujivet.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c150aaa8f23---pedodopajik.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee7883522---50344291990.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/ninexiwirifozemej.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/39626cbe0dbaa5be9114d96004b611bc/36951279603.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/1624979741337.pdf
    • http://www.salpasafarit.fi/tiedostot/files/3119527715.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/93920358031.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808fe9b12d---83247099041.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edafec307---93633907750.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845f5197538---94986965157.pdf
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/xeleganibirugumovogotemog.pdf
    • http://musorcentrum.hu/files/article/file/94691216657.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf61cd768---61777011113.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/in3qaa43m716b6l4e9mkbljtn7/7377752615.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/eb899894d8a6e4abd0200c291841e50f/badozalarasunurudik.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/dcd3eb9e9dc63a5c1a72dd3135d325ef/musok.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rceeqasghki2sshq7heacn53v2/vemegonunot.pdf
    • http://hyundai-dongdo.vn/images/files/lixanitodafoda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=should+of+would+of+could+of+quote
    • 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_off0000bf3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 16792 bytes
font_01_sfnt_off0000d752.bin
ff0f28a181ae96a479c6f38fbcf2475af5cd04a066ef63c5b79c099db64c5907
pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10356 bytes
font_02_sfnt_off0000eec2.bin
807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16892 bytes