Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a1244085ad45d9…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 08:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12884af4d997fc1e244414c56c4a7af7 SHA-1: 210d0bdbecef0c996b59992e09719e0e5b36d205 SHA-256: f5a1244085ad45d9190d231e00a665559bd371962b383ced4163b188b4f22de4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous links to potentially malicious PDF files suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ohsongpharm.com/ckfinder/userfiles/files/90757001663.pdf
    • http://auchli-appenzeller.ch/userfiles/files/zowubopewogufoki.pdf
    • http://akcjonariusz.com/UserFiles/file/60867908585.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4f0af7c3---wadilirowejivero.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9922af2fe---kalijafasu.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072becf39bd7---38937070937.pdf
    • http://cgl.lu/userfiles/files/raxuwalupad.pdf
    • http://houstontca.org/Content/uploads/files/77755795347.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f6tp8d0nkr3f2gsqtdnid6a8c1/54349896901.pdf
    • http://laduses.nl/image/file/lisadugiboxivarela.pdf
    • http://shinies.ru/img/lib/file/4687905708.pdf
    • https://arte-salon.ru/upload_picture/52132364040.pdf
    • http://amoy-art.com/Upload/file/82104505122.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802e2e0f3cf---35983314717.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c16383b47dad019e23ae1ad35396f9c0/89458345163.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a57688ab24d---ketogawevulakel.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797d74e657a---xogiwag.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90943b604---87895793481.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5cc624dtef3gq2m6ljaoib01a5/ravulad.pdf
    • https://dodomacnosti.net/data/file/50598149782.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bdf84df4b8fed0297cab214d88a9e8bb/4124189115.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083818b9db51---88184698250.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a47dfd4d8433a77ee9ec5040fa453516/lonuludotorisiwivazukugi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=step+counter+pedometer+app
    • 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_off0000f06e.bin
c86f538bf467da37ddabb9b2992b71b6c485a85451377bfe63f7f068dc84975a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10544 bytes
font_01_sfnt_off0001086e.bin
d3c9e42f35fa4f033ec7ae38d24beee60b7283bad633fc279c3c5aa6bc2e5e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 17072 bytes
font_02_sfnt_off000134aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 16792 bytes