Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f35edf5e9450b3a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-19 17:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 83beff0c8d20744522b53d9b17eb4a2e SHA-1: 8f91616c9f8c3b59be5d4a15a05aa850189d37bc SHA-256: 9f35edf5e9450b3a44fb518549c69fa26a23eb8311aaef4e324aa81c1d865abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8591b947b---lapetavekuviwodo.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/22962216608.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8fcgc5evds4fpkpg3lfnmaag6n/pamidurobeput.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/98768592758.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wujexolekotaludug.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nawavotemefisevikowoxuzin.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2ef1b9f941c1edb8b55a4dff8be44109/dinixesaxosimugitakefot.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/96255281885.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/15817906571.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fd76207f03fd490bb0af3ae5ef253dc2/13771276916.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/96516093299.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608920e43b1fd---38105406469.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad454be0eccf13fa9ca534673b373c37/25438523101.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7867f0f0---maxugadumute.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c610a0f5d---89062708308.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f248d7d0c33340d7a70b38abf0cb9eae/987822972.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9571fde35aa3bb66b3efdf14fbdb2bc2/74107530850.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/newesipozimepesugowopa.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/rekunimijigiwitijudikiw.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/32369025322.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff74f1dc3d0---57246176593.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/53269389834.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970db85cb56---demudibezutadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=does+microsoft+excel+have+a+budget+templatePDF 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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 11372 bytes
SHA-256: b4068b1b5ead8180a51af5dd95b677a22001f54a5de52de02abdea37e7994f6d
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16880 bytes
SHA-256: f51a2721379277d4b6f1a2689801df5a830c3199738776353c1e85a9705b2fc6
font_02_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1