Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec64ad6609cdb95a…

MALICIOUS

PDF

83.8 KB Created: 2021-07-10 05:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3bcacc9f4e32cc03a8e0fb77047da54 SHA-1: ae94a9574e9ef9df955cb820ac2d7b651cf6fb94 SHA-256: ec64ad6609cdb95ab7de7b380da3955771ff6fd53069023752a118ffe5533a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=invisible+space+copy+and+paste+fortnite
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ec9ff02a7---jamuxaleseviz.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7ee8ce35---kadixitepakuweluw.pdf
    • http://medob.org/SITE/files/editor/file/weridenaxozorejuzuno.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f98ec63b9---9277572562.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c079ef6ac2c---vulalerufomozunaretom.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217a3203a1---kutavumujilawaxu.pdf
    • https://digireg.lu/upload/rulawexazudobepoxebe.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcfe07174d---lamazoburogitanum.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a33d6653---gebifomol.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/bugudabamagevorixirikov.pdf
    • http://shahnawazonline.com/uploads/files/76351695580.pdf
    • http://nw-line.ru/generic/uploaded/vozopura.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e7e7f147---34504239751.pdf
    • https://dobre-akce.cz/media/files/file/73263819436.pdf
    • http://dchs1961.com/clients/871949/File/fepomimepixexunu.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c435360e4---19384464491.pdf
    • https://akproauto.com/nbloom/fckuploads/file/8667307862.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/3327925811.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6671507383---wawufu.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b435d433a9f---57257684596.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jku0en8pr0mn2alcrknkqc1ti3/37423545753.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9a3f29d0---nipajub.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasigame.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094274c526d7---99606546707.pdf
    • https://uleiuri.ro/userfiles/file/11607711896.pdf
    • 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_off0000e671.bin
fd2aafd624bb1cfb370d00bf44891d38b9c81408669d3f605fda3a2c5d970226
pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10884 bytes
font_01_sfnt_off0000ff8d.bin
d32bd8cde5f3d6d103ab292c41ecc4711b1b70d88d9d9b259ac0181fa221abbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 16332 bytes
font_02_sfnt_off000129a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16792 bytes