Malicious PDF — malware analysis report

Static analysis result for SHA-256 2936d3bd807e5295…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 05:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 245cd23eec977861fe5e917292ebd63c SHA-1: 079419f33b1138af443a84881d0acccddef38356 SHA-256: 2936d3bd807e5295aed1c69ee681b635907868f3372d5d8847afa2ea40647f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be compromised or hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=industrial+revolution+worksheets PDF link annotation
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8e41aa9af2340efc31856e870829b7c0/pojojumotan.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/73614093082.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/76389184423.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3595b4d2369cdff5448c00cd74bb5b8b/leximibegumazoliwovobi.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/jabafadixegavef.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/gagovajaburapezox.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/64060996853.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/makatik.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9770bfb692dcd839ebec21bb65a277a4/73488445765.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad1db0c8c---befazufokojis.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/13982128302.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d96af669---xevipakozonusaniwizet.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/midasopileniwo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/010d24c3e56b48f2abdbd5092d3a81b0/wozizidisifufujitalom.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f79e834f---152558244.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61d2244248---19236293263.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1c9a88b9fed7cff4b28b778bab3d89d/tobobisuxijiwegogu.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/newidatemumarexawirovoviw.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202108171252466578.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d645454d13f---72033230077.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/legona.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/sosilewile.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2fc12dfcde2408bfa032a9722bedf4b3/38236731344.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/74216056455.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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 18220 bytes
SHA-256: d74e5cca0ad8c10154723357d4a6e09f818cec5e58f8de11efabd19ca356dac4
font_01_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 10640 bytes
SHA-256: ea4044c48ae1d14b1bd014554ac1409843c6fce104d9f3685de1360820b3b9b6
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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