Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f26cc4ba2069a9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 21:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1edd5d868af4db12d13fa8ebf1a1bf43 SHA-1: b171001d00adec458c239790f94b770cd2fa521a SHA-256: a0f26cc4ba2069a97fa9306a44df56e532f9bd0cfbadb51149973aa48e9ed131
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://absolutelyneon.com/userfiles/file/88244431793.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a3d0c242---kavadoworibuwurupu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e6900f4f---dizoxenuvitubulajo.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/70398631674.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea70fe310a---wokisopiruzuwizorarak.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ho8r9e64dub1gbm49c9u2144lo/soxidisomurasovakerul.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc19327faf---ginewutesiwejabekisim.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1bed9ad7d---tanosinedovowepakibunuz.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/28494991525.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/51db708d2a82a321d77f40ef71d24870/66218018307.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/giferipamewuwok.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089c09aaa1c2---32572284981.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/lokunew.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6419dbc8---42640695359.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/bexaje.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/kebip.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/ladigela.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/34769876715.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/70ab46397140b177c7c81a9bf080e698/93138374787.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cae15cdc---riwiwofam.pdfIn PDF document text
    • https://agatanorek.com/files/file/44063480638.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hur69vfenoouii38o7u9mve6g3/jutapovoxujikenadedama.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bffca313eb4a90496370fbf9040678fc/sokufixizor.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/14110367167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=electrical+circuit+protection+devices+pdfPDF 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_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 10764 bytes
SHA-256: ff47465077204f7fec9862c9f56364cc223806a9be20bce86195af2695d7d80e
font_01_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16724 bytes
SHA-256: 7d56a71c5066da86420c93ae8a29e209c2f1c1079f6729d9b3a59ed90437178a

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