Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef6ff83add59cb0…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 01:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 15ee533167ae32b735070e8565a6775c SHA-1: f03497158442118d14e098dd5dafed3f082cc969 SHA-256: 7ef6ff83add59cb01a207cb87f0b99fdc4a52bca3be35569ffaab59a1a4d2bb8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=game+booster+2x+gaming+speed PDF link annotation
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2a1837031c3cb6875f4228e3a0a91366/41174581776.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/crijra1cstnbulhkeqde3rj6d0/30925435573.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fdf7513ba8deb549f141e960ed145542/sijokivawuremexumujalu.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/42425917007.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/tqvhcch2ef5ttlmdvdj9rsfsm7/kanoveromobowanurajotij.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/kefeketofebu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/631fc595be876689b14ae35a35cfc54f/77316778668.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lakbtgifm09c1rq62t0901jpv0/noxuximawazitagululawa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608664c27342c---vexotota.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f6519bd9d8dc47f222fac39f1677e5f6/6429344969.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/56408817527.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512150959313819.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/82890418509.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8635a73a802facd39ee906186dff880a/labuwizikeluvamapave.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/26072227755.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/91574249385.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb04985ff---dusiverigapirideta.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee50757cbf---duzufafuwix.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/vagutije.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d293b0c---28854963868.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d01267c9598---60286639895.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856e0bf28c8---laremidoriv.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70497225f---9057032733.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/zikimutopizidoma.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/tejakap.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/kitixikidazarotajuz.pdfIn PDF document text
    • 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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 17468 bytes
SHA-256: cdce4c6fec4a02e162471ff19ebbdf413ca46fc78cde117ea5169fabe2adb84e
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 11092 bytes
SHA-256: 05510d148fcd940f31f7d2b093539d257faca622511fc59136e89315c2b163e1
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1