Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ad7dc1e1a3dc49…

MALICIOUS

PDF

80.2 KB Created: 2021-08-13 20:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f17172e071542bc7c686445555f6190f SHA-1: 20b7e86b0e967b9d80291ceee8b9c633d11f4bf2 SHA-256: f7ad7dc1e1a3dc4994d0e1bfc2c1c823340a8cc3e31d56f1d9349364cf72cbfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm hosted on potentially compromised CMS uploads. The embedded URLs, while some are marked benign, point to various domains, suggesting an attempt to distribute malicious content or engage in phishing. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/t0ga5p2ppr269rm9jienl3adk0/59161781440.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607743ad72005---gulejuwewe.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/lr4b9ueochltn7r1oolsrijmij/5903144472.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/16654232360.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1d2dc7d5---xunineliruguwojuluwuniwuv.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/37628564820.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b780092cd---24110517419.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/18475286633.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/edb259376aba3ef8982245bacb2af40d/wewetomaxonajen.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q187bf81otr914n6kjfcogouag/9777133446.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea53ec886e---73258931602.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611388d5a2bac---mewowuxitazofufulipobi.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/50430761702.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210524041551169.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e399184a347---rosimofexepajupirajunela.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc90a349d1---fadiwaninexazixas.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ddfe5899---23415917206.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/88452060934.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/onoavi285d6mp6nvt3dfrnrf80/kubeziwijupimilog.pdfIn PDF document text
    • http://talleresjpg.es/img/file/vebonuvonedapidifud.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/53248692769.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lghdfupss05qj1lvpu6qeekjb4/8185827670.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae355303b---80037239719.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/4350318544.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-7/20210707194334398920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=division+worksheets+printable+pdfPDF 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 10980 bytes
SHA-256: 4fda460102ca5ec35796b438fd564e47606464ecb13334f186135721f4c9e0b0
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16332 bytes
SHA-256: 567e2b6d406b9527d7fdc46a7ce6e3df8c88591e34cdaf70776d9734e10a497e