Malicious PDF — malware analysis report

Static analysis result for SHA-256 a808095c6d3ee835…

MALICIOUS

PDF

90.4 KB Created: 2021-09-28 10:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6796b23ab4efa07915f521bb7d9d9ebd SHA-1: 07c78625fc4aa8b4ce7fa1685b52931acae2b548 SHA-256: a808095c6d3ee835e666a95368585732bd8f942c54bd1014472bef53e559b04b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://allytemp.ru/uplcv?utm_term=anka+game+apk PDF link annotation
    • http://qdxqw.com/uploadfile/file/mipozikenasebaxudofituga.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/telejog.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/nifix.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615194eef317f---20973945158.pdfIn PDF document text
    • https://mackbeks.com/files/file/59665881634.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4887226749.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/xudutusos.pdfIn PDF document text
    • http://thevalleytrader.com/files/supoje.pdfIn PDF document text
    • http://chinalabware.net/d/files/levoladexokosuwi.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/8943425620.pdfIn PDF document text
    • https://tsegypt.com/file/gidusilijivemusewonubef.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3effd5258---84482202404.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/83884441278.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/8905407637.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33567998318.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/52866824793.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/3170141076.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/derika.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/60693866768.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///jameselopefanuv.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dojeno.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/21282603482.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0ickmiditrn629r93lum8o2cvv/nokaturidajugijusabira.pdfIn PDF document text
    • http://exosushi.com/uploads/files/rasariw.pdfIn PDF document text
    • https://seger.cz/userfiles/file/73620931607.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/45206611838.pdfIn PDF document text
    • 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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 21800 bytes
SHA-256: 59c4b5cfd15fcac1510ce0ec2519f1b06497ab6ce24605f1043e8b401501280e
font_02_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 10044 bytes
SHA-256: b7041572266e54a4188439994510148a4cc4842e4b933504ccb3e71431a50285