Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d4f5ca0a584818…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 07:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf127e77e5b8a19979ae48101bb3e266 SHA-1: 30796bc34389c2aedf23185270599b565fecf032 SHA-256: 56d4f5ca0a5848185e102fadd16f0d3be5eb662dc8ee1ca537ae1e79441e9f42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6el67n093rca2hn0jvh23b3db0/pujajaferoxabusa.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1c9b526fd8067394ab3d74c03853e48d/84348472497.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a69fd0f06ca733381ba5a2b188f1a9ae/31622152636.pdf
    • http://landpas.pl/upload/file/86180061119.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd1a9a0f2---lavorogoxitafop.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812a75882af---85414894306.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/gowerawerep.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/l1ror406hpfo1hioulcp77mad2/75784847084.pdf
    • https://people11people.com/uploads/File/ravijofasuzitul.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b554d8f437---3700996848.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0erkesf969001sgs5dbvm30ib7/mezuxutizusefedipeniw.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6c7e32d9---69413724261.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/830fb8f7d947282afc6aa4c877dad01b/64901550286.pdf
    • https://ludifrance.fr/userfiles/file/momikafojatunekaro.pdf
    • http://www.urbanwaterways.info/files/93711956964.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/gd8ltd71vlaai45thkbdups151/mutaxikukoseferudegesa.pdf
    • http://bezagsecurity.cz/userfiles/vixanosovon.pdf
    • https://cengilli.com/icerik_images/file/97652922030.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbae65d03---vekirajumifaw.pdf
    • http://itkaufmann.com/images/fckimages/file/2516126741.pdf
    • http://3qlohas.com/CKEdit/upload/files/79647999797.pdf
    • http://hum-lucknow.org/test/fckeditor/file/49176831660.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/13b0d681da6629f5a0c9893a577d4136/kajonogu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609219e8988f9---xulevolovewotos.pdf
    • https://asset-books.com/userfiles/file/44659975199.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a8e48321---setufuzezoziduwujo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=home+burial+robert+frost+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_off0000fb5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
font_01_sfnt_off00011371.bin
4fae94fd435f000c123bbf7952e853b8f2f1a7c02de1f024a6bf0de7ff3742e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 10784 bytes
font_02_sfnt_off00012c00.bin
22cfba332efa7316bd84ec7e7f0866b0f5ac8d1688ff2ad5e4a68a881e76b597
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 17068 bytes