Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c46e8cfadebd86…

MALICIOUS

PDF

82.2 KB Created: 2021-07-04 01:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 628a28ae198f7063efa8417420a660a4 SHA-1: 0e399b546bb9f2acc6c41115172b1da3ba9d3dd3 SHA-256: 91c46e8cfadebd86b45479667daa6d3178fa2701ac740865d278bed7cc4b4466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS upload directories. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://easy2ticket.com/upload/files/45830391897.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rc0ko6iq9ah4lsoq41mg5755s0/varinotelapofixixedazox.pdf
    • http://mt-filtration.com/uploaded/file/52333173560c11128e4164.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf241c36f8d---22976821827.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0423f3291---kutum.pdf
    • http://cottoneauto.it/userfiles/files/zimogexegidafekoviguru.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1c8ff09dc894417734540e950c63fcbb/28819284138.pdf
    • http://absolutelyneon.com/userfiles/file/23088225463.pdf
    • http://drivescuolaguida.it/userfiles/files/lariwib.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ae4ab147---86278451209.pdf
    • http://allamericannursing.com/userfiles/file/71887142515.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dd83aebd963e3c205cb12f62dfb2bd25/deponozujireruluwov.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89a25d53c---42858514026.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c6bdb8a1---xovogup.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4b4d46ca21dbbc8a12ccf9e5fb029817/67370690660.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160deb44724617---79231458906.pdf
    • https://soechi.id/userfiles/file/88807858355.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/c1qkob10ujtt31hp4vf727ld9c/wevowava.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7288bcebbed144f85b75a02a299c9f8f/tixot.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bt7bd46vo55vp4rqlgf2qok5mu/bisonufun.pdf
    • http://loaamtran.vn/files/usersfiles/files/96758021889.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bfae924ac---25418130257.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95281dd287---59072020563.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=accusense+charge+troubleshooting
    • 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_off0000dc2a.bin
d969e702ff0781174710433e61cb92b758ff38cc6606a50ede86fd261416d4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 10728 bytes
font_01_sfnt_off0000f4c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
font_02_sfnt_off00010cdb.bin
3a053e551d5a5ef94b82c173ef09eb06eb53a0229e9b3fb88071e679e368cef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 17324 bytes