Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04c6b6b2ed2a930…

MALICIOUS

PDF

85.2 KB Created: 2021-07-19 08:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9319cd8d3644b3a37bc2333868e91c0f SHA-1: 504b4ca1ce11b903a681cd4f9bd474ed5ead73d1 SHA-256: b04c6b6b2ed2a9305b041b64ce9543dd13babe741eda3f4a6705a0c54d7e2415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious content or download further malware, likely via embedded JavaScript, though no explicit script content was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mvdeastudio.it/userfiles/files/3856569921.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d667ef27d61---57018017871.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0db9746251586ebcae441dfb490d4ec7/88127808453.pdf
    • https://hogies.com/includes/template/uploads/file/pokavopabamakib.pdf
    • http://sgd42.ru/userfiles/file/vinebexuzoxoxopaxijotija.pdf
    • https://thegioibaobicarton.com/Images_upload/files/donelofuwufododipawexavu.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/32034840648.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3ujk6u4mad6ebh9c97mpge572g/jevukunibebadavara.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/938e2c617360f17b78d5292c5c81d67b/xumazozulaxivunigix.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/35c932715a32678024821a8faa451688/12362065870.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/31617505932.pdf
    • http://rund.cz/UserFiles/File/94795510814.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa2206bfb---zimemifitilopapeti.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/51535457214.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ca2b8ddfd---45294411570.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1b663de7---mezeradepidusi.pdf
    • http://bakoca.hu/files/file/rowilegixiziwasinovel.pdf
    • http://changdahk.com/upload/88522372818.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/genipupomosobobotuwini.pdf
    • http://andrelandberg.com/userfiles/file/romepozal.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5dd75be84cd1bd75da92d31a47bf9141/6168078313.pdf
    • http://acquadiqualita.it/ckfinder/userfiles/files/54240922888.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nuts+outdoors+galena+il
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16792 bytes
font_01_sfnt_off0001010f.bin
f56a8ab2c1d7f32ce57305839f712c48ec6b12310863ddcceb208f56865d3ea3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 10500 bytes
font_02_sfnt_off000118db.bin
70f5d4cefae848f6c46986acc87039fe85c202d8d8ce2702ef0aa48e6569f2cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 17332 bytes