Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9c2b527c25b5b0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 08:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2c735e98168bf9257b98385a913f1899 SHA-1: 65f1dfa508d0574e53308c6e16b118189e7b5623 SHA-256: 3a9c2b527c25b5b0a4e01b2b60cafa4f583a90c9c1dbad33398f2559980d89f8
156 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 0.9996

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 http://safaraval.com/basefile/safaravalcom/files/roxagibomexate.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/94956176432.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079005ca3291---kefomegafip.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7f88a85d67e7a0076519389e63156525/75150888042.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/mepufifaxasakupuwuzos.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/18833750628.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210626162824_1gs20l.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b3898cd9b9c3bd89dd374b5995d2136e/15529702619.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/cd6f2de9df8f5e91bdb15a7f1b49834e/22343709538.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fda50e94579a69a9036517fc49b2d44a/39668271434.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4298d219---laxokudaxerekinigujiva.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/wevofekobujiwunebatefo.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/wijopabebela.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/12157686869.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/fb5bfaefbef6e9bdd06a01e3323c0d01/9670018825.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/fumenumazimuf.pdfIn PDF document text
    • http://amandamaitland.com/images/file/99243159988.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0fb584a59d2e085e446757065a95f090/kawakakoxixomeliximigot.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/40rpl3d7e8pula0cakja17hdgd/6367983636.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4afb9c34df---91424929239.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5aff81bae76ba1d1b474a0d1e65e7b4f/zazofike.pdfIn PDF document text
    • http://unsersohn.com/images/file/rulozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=envisage+in+a+sentencePDF 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_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 10188 bytes
SHA-256: cb287977aef2860ccc2c870359931447394f88a826af768487f226c1e7833fad
font_01_sfnt_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 19008 bytes
SHA-256: fa0205466ab6979142c81fd12bd803c8afdb3d09b56c4ae5fc02e4540c1b8fa0
font_02_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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