Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6348c7204af98a7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 19:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 54596c5104023024ea194fbbc960140d SHA-1: 41834f5821f39698da597d6a35e12edd2bd8d6d3 SHA-256: f6348c7204af98a7185f50d82ddc9cf487260339bd8072536d2b83bef4adb573
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.bargiel.com.pl/ckfinder/userfiles/files/lomukevorewiluseso.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s73b07v83uknf41kj4mhgq9jhu/gilenuz.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/61490124077.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311390b115f---revawiroxudesojafiwe.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/49146263749.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/18027636974.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/94878726398.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/77910158873.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xejofidofikop.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fivalupidopuf.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/77129c5d891ea334ecb8a8d35e626fac/melajalanetaboromaguwi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/34763960156.pdfIn PDF document text
    • http://moristas.com/userfiles/files/pakuwalulegivud.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/jekagunimojekisomipapenal.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/foxatobesepofupimadaj.pdfIn PDF document text
    • http://vpsystem.com/files/fck/ladutemomusokokunaguriko.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732f4bfa61---vixuzoxazodejerurogebifa.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/zuzemunopujol.pdfIn PDF document text
    • https://diphong.com/uploads/gamevobegaforuf.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/gofofajipugaz.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mavipegulofagejepi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/gapelalitunajalexeg.pdfIn PDF document text
    • http://iviltra.lt/images/files/22302547920.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905031915.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/97227976074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=otg+usb+file+explorer+apkPDF 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 17152 bytes
SHA-256: 027794c30e4b50722c4f99c7b8c29e6efab8cb0c0d6aa9815b3798e71877df8b
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 10888 bytes
SHA-256: af63d7f9dd99fc767ca402fa1cbaeb8840cad16103e81e6fec5c928af8bce68c

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