Malicious PDF — malware analysis report

Static analysis result for SHA-256 664cf480f34317c5…

MALICIOUS

PDF

90.3 KB Created: 2021-07-13 10:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 235a21cadcebb1ab9109263e8505b728 SHA-1: b5b93decbc57c253b4b9c9ff8fd47276c3fca889 SHA-256: 664cf480f34317c5b95dbc7ae70f5b225b7576096ba7e0f672e0fe658e4e6f37
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://oilandgaswork.com/userfiles/file/57208137034.pdf In PDF document text
    • https://wendi101.com/userfiles/file/99547330012.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/fapibivaduxelupotubapi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/14442114759.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/db8dc6f70a3208d5b2cbf02175dca7ce/96391735066.pdfIn PDF document text
    • http://ahchala.com/img/file/zatopineminibap.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08dc5251b---xavuvuzibe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094142a5a090---rivaded.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/862fe29eb62949bdbc649bda1f7f0f8f/maguxevisowagadekutej.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d008a31f239---96960971054.pdfIn PDF document text
    • http://vce34.ru/attachments/file/89005219370.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/wozitizirulapigexifuxu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f8280b0e91b23a2ec4d1de0a667bae8/jevuwuxug.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/49f5e66aa1d72c7bd36b04df2318f341/muziwofusafazemowa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7353343176c1f6098d19ab70277fa3ad/kigiwularexosirojep.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/47004569703.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/rikofevelovupezofokojare.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160945c91b734e---paserapupafiwake.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59f7797ef4b244d952dba197f67f4f19/vadogoxi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094be808c8b6---76460760871.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/731f5b8e70f362594c12096ac812b989/bexuzosisubilavasefijipe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uhvv8rhpf6tptb0fiqjkkobba4/31353760268.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3694f2316---pujudanoniromefuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=scriptures+on+god+being+our+fatherPDF 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_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16796 bytes
SHA-256: 3df9747c9c7fb7501193f7459d2d67aec22a75cc13f2bee0a92d07aec6c788af
font_02_sfnt_off00014285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14285 11168 bytes
SHA-256: 95f75f1e60555e91aef59c84fe89c09d60b96bfcdc945e80e397879c21372028