Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b16faf021470bc…

MALICIOUS

PDF

88.1 KB Created: 2021-07-05 09:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 835112ace3cc31c8e920a319232ee946 SHA-1: 583b255a3019543e8e0879b3eca7ecc7461ca9fa SHA-256: 99b16faf021470bc95c29a75def2ab9c1e0ad9a1f2fc15c867b3d3ba23e916b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, and it contains heuristics indicating an advance-fee scam lure. The document body is heavily obfuscated, but the presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggests a phishing or scam attempt. The primary goal appears to be directing the user to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=academy+awards+2020+winners+and+nominees
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f04uoiin23td0cuc1t1h1ppcu5/guzazisebijodazefaxokovu.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/17387872555.pdf
    • http://best-infosystems.com/userfiles/file/dusanugotugujozovov.pdf
    • https://mfdesign.hu/files/file/gokazazerusovaf.pdf
    • http://baovevietnam-vnss.com/upload/file/luredafidekozuvamarik.pdf
    • https://wfca-czech.cz/temp/userfiles/files/nepuvokekodejofilakakakel.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098602a21f1c---xexuwiboba.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/robidugavetumo.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5917eef7cda3c00fccac22cc8c38f3bf/lekanoxabilazepapumumituf.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb8cb24397---fawofu.pdf
    • http://sola-brothers.com/userfiles/file/75300901030.pdf
    • http://sibinetweek.ru/userfiles/file/88943021749.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ed8a935cb043f5849d35ade4a3590427/86701088394.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ba7ec179ba4221f8304beecfdc75bcae/parupesob.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ce04102e1f71535d97f9e406bec2d4fe/daxumexenutikiralovo.pdf
    • http://allasclub.com/campannas/file/9711887122.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607febedae114---36343307794.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860e5f37260---96746781405.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/75530gcorg9bkedfagnemiirp7/4389899624.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bes0pcpul76d0nlgbng2e58896/76174544868.pdf
    • 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_off0000f185.bin
d95b0b449fea9811db4303d69d928f902d73bfa23249009c2a989c96fb76c46c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 10808 bytes
font_01_sfnt_off00010a8a.bin
696ddb7a2eef0775d2c89399fc665a1b1fad75ccce82a155ebe804d7ff51731c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 18020 bytes
font_02_sfnt_off0001399d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 16792 bytes