Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d96d06bb936915a…

MALICIOUS

PDF

71.9 KB Created: 2021-07-23 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b732bc49748e9a4fd50166d0b7621985 SHA-1: 86b01ea8d9288b88c74c60c81d3aa50ba8f83564 SHA-256: 8d96d06bb936915ae922673e92d5a14522745c3a1df8c380c602894126955691
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rubenoferro.com/userfiles/file/46625136579.pdf In PDF document text
    • https://brahmagnanam.org/fck_uploads/file/31397247201.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e0eccd3f6c672066633ea4a0513592b5/gikuzolibutobudosabid.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d855035b57d37c0a7b20b430d527de05/71141994665.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d6814ba24bbe530e638d7c1616e83f3f/daxitakov.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97f27d27d---gojofula.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/xelazoramesasipelo.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/94348101876.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/3252811136.pdfIn PDF document text
    • http://k1a.ru/images/files/file/kadorofunezajekika.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ef0bb0c8---vetupajojuvifesetufeji.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/380bb6af16771b56a83e04f245dd5614/54252675342.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/75832693251.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608076351daec---tavilixizuxunedawipu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0e40847433cb31f1bef2ee37fb701b16/79288284143.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3647eb021dfc58e3631f92166f15aa12/foxegalamoge.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/zafodamigim.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160848cfe5939e---92786748176.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/lababikorumusowafuxemux.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da70a2b780---siseludupit.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/10357c1edbf3c8b3df12420e75dbe18b/44203038707.pdfIn PDF document text
    • http://asustainable.com/global/file/sovugu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/67269348421.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/252b48889870764f202c124dcf9be4b0/xipulopirixagaw.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/frr05bpbsf0k47vn9sg3ei7gl6/wedegazusokizererejumol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=flasher+wrasse+typesPDF 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 10208 bytes
SHA-256: 8e5e5c7dfda30982cd887c04e5071904be0563fad1a1c9fee9f10f1c405b8d6a
font_02_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 15984 bytes
SHA-256: c863d071809d55df258eb5c914f623f8fe213ac7f0c6ad477385290c93613b4c