Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f88b51c46f7aae…

MALICIOUS

PDF

92.2 KB Created: 2021-08-06 18:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c85ce89de289cf4a55487a1df4ba24b SHA-1: 48218431bab16b82f7e0a05c697cfdac95788f1a SHA-256: a4f88b51c46f7aae3834b45e097145b4d2cee79b00d241c8710a0ea6c64d63ad
196 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 0.9906

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kondicionery-dolgoprudny.ru/upload_picture/file/11089761506.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088826f83cbe---94311827147.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/75664918433.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/kuzuvewugek.pdfIn PDF document text
    • https://maclashoes.it/file/66308517059.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/bemimevoletejixu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fukexututokudof.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9cc6204300c0a8da9aa79a39ffec780c/kegememilo.pdfIn PDF document text
    • http://htygroup.com/upload/files/15295198102.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6208ff3b1d17682dea9045d8fced3552/lamimufajikesebozug.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/19263744080.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4592bf7ab5471062cbbe1e5816e01edd/kezefusilegejedopawevejil.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b221540ab9a---93498030213.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021080319492873499.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2bcd34a9---99896331296.pdfIn PDF document text
    • http://sns.hu/_user/file/soroniwi.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/8369940379.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb308a532---rijorujurosuxasiniwetat.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ca966d2c---tipeduwatetelobugatiz.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zoxarafipezomenerubirege.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d33eeb6da---9253231939.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/41832916145.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/wemozimilimolovugibabijib.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d2bded0e---revibitikanukaburedasese.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/182a32d996ce0c82e227207719396647/videmotanemasoz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57264de8f---bipibodade.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2c63da01b---dibajanabuwunebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=twisted+tea+ingredients+labelPDF 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_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 10492 bytes
SHA-256: 3daebb42b10f9688ad23a664083a13552ee809ad64b361422ff7c47b8cf73390
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 17928 bytes
SHA-256: 8ec45c928c10c6d84d0f810d588c1b3251dad47e816b44589fa2639bdd4e12a1
font_02_sfnt_off00014ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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