Malicious PDF — malware analysis report

Static analysis result for SHA-256 983449ce8073688d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 14:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8059ac5743be0e87bdb14050eb4c40e6 SHA-1: 0dcfb269ef027c8f2f17ede641119376a35510f4 SHA-256: 983449ce8073688d97d9179ac3d7a177d63928a2544b76414ecca50ffd81e195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=miracles+happen+brian+weiss+pdf+download', are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=miracles+happen+brian+weiss+pdf+download PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a971c81a44---59181167094.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8cf3f793---wuzununolozadokevetutebis.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/lesax.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/lemunevanon.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/zofevunureratexepowarafil.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4270244d2bb8440c345c1648129f27b8/rutozidobosiwajur.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f9b9937d5e4ed27f84f41a53903c7146/98396494293.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa12b3d12---divaputoligubetam.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/510f9bf72fb3bec53710d0e15dfa4507/selabogavimeri.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/41523794212.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/roludarin.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/temopukazuwav.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/sinugil.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6bdffbf972f8bc77c68405ff3e73baf0/juwakafurabelefixogonibex.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5a74d1dd965bbcc542125649a5487a99/17339845794.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c4e8fc816581a7ee33a3340b072734a9/vegigilobakoralekejodafe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac3f97867---34325159344.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/49118349405.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh6rm6uc9glkkoji1bhtbmtoo4/jurezesotudafusazuxokoxa.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/64015454886.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/20921482943.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114ddd1f1158---73853588965.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109010921191122.pdfIn PDF document text
    • https://dietacud.eu/upload/file/66182494750.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/37500447779.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/xelevenorevomovaxibiba.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_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 18016 bytes
SHA-256: a3e314a8c09ed823ecfdc31f64f021125fbd7d2e1c3eacdd8e1c193d89605c2f
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 10840 bytes
SHA-256: 2a4b4be6372eda33306caaa5a97b4903770f0fa49c1e33624cb7790feca7840a