Malicious PDF — malware analysis report

Static analysis result for SHA-256 7925afffa9c7c883…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 02:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 562c7681bf100044a92aea7b5ad68f3f SHA-1: a9e4e04742a3f406e2fd1981c3dfc696b4a9aea9 SHA-256: 7925afffa9c7c8836a66e37114d7f58ca110a849787ea8930b6139d3c8aa24c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8qjch36336b03jikke5u4so8p0/3579837047.pdf
    • http://www.bufolari.com/public/immagini/file/36279036696.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8dcbb20be1b698a3979ed2959b7c5b17/wubibusififo.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071de73aef37---73530333710.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbb10059c---88166307476.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e44b49693---37102365802.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bdfc3b321d7---baganijitad.pdf
    • https://estoniapools.com/contents//files/jozuraxob.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1ed1194098578c30e8501205f2e3cf61/77854960268.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8e125152---fafawininafagutigabe.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/54648855752.pdf
    • http://chalappuram.com/userfiles/file/mebabaso.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/33c09ad7jltg0svrr9gckjf1b7/1086138620.pdf
    • http://brlairport.com/images/file/tupim.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3833c3057---56482233171.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6016c6747eb7a7d31eb28272d84087dc/gowiripoze.pdf
    • http://dzstock.com/Upfiles/file/mexatan.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5b558763---mowasoxu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960dcf1c19c---17819707282.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80119463d---86127352505.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/36ac95a08896f90e85edfa6481a86129/92114782274.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/u8m8knop2somsgpa9ab8ka5d00/gijani.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95d513591---rozupugarudixivaw.pdf
    • http://alibabashipping.com/userfiles/file/78952975660.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cca87cfe---60423313748.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/10634255913.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=salem+witch+trials+video+worksheet+answers
    • 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_off0000f0eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
font_01_sfnt_off00010902.bin
ca982155445e09c021c2fc9e3ee9f9b61830428fb6ab7ca9b0cb4c40b34cc357
pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10952 bytes
font_02_sfnt_off0001223f.bin
f1f4b6cff46e5ba5bafc8a88aaf5fb5c71e88ae9695ce6078aed77763c704c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 16696 bytes