Malicious PDF — malware analysis report

Static analysis result for SHA-256 9554af96796658db…

MALICIOUS

PDF

85.5 KB Created: 2021-07-22 19:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a326edad902acad6a140906510afcd26 SHA-1: e3c3583400ddbc8b3ea8fbfe5c471ccb54a6465c SHA-256: 9554af96796658db00ea746eea59b8b9f4ef8ece98fb675d557c4289a223a15b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS installations. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a redirection or content distribution scheme. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://centroolosprato.it/userfiles/files/76138966199.pdf In PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/32614323883.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fea92de8b76a95c7d299217607c0ac67/55074254357.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/fujopikidixovipaxub.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2ec15766---bejuzi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083637bee49b---dojugolobiwinakivuxak.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1t3j6t4rvh3o0qfcuj7n9mslk7/wogapemopugobamobemimime.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/i99ctncfh0769jb1r7uor8kab1/dodutexap.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0emrpr8pqadec5858vcghsbl9i/90344816722.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/785937650b92d599db6a7dddefa2223e/19940236613.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ihec6b7ieo2jbsjrhm60n7ma28/wegekunisotimuge.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160799ccc808a8---26788623693.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2919f1de6d---81529028399.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xerozadaxofaredirogobozo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1s3k3m4sv7fk7o2k1th0takma5/45311154669.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/5320311991.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/74744933056.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kezorurowo.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/69930920700.pdfIn PDF document text
    • https://yuss.it/file/65734397642.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sg90t14vtgeju7f05kikjd88bn/32826026599.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160808035d943e---27003433698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+color+do+you+get+if+you+mix+yellow+and+greenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 11148 bytes
SHA-256: 2b8a475ba73ea9538b04b2fcf223cbdd1fc60216968f30837e74835d0450d425
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16988 bytes
SHA-256: 4d08dc586ae7341236f2275b3b6236897e4c4d0f49f261d03ed9c8265e6b11ad
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1