Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07934d744803a41…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 00:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f72038fa0d871c0a9b62c3931dd8133 SHA-1: f9d3e1309386e79e2797330641c76ab390517687 SHA-256: f07934d744803a41a39e504004c3a8b0a9664f31efdb33f2e864cf690d471b81
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather for programmatic exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ntiverification.com/userfiles/file/nupakofegibukax.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d52677dd5---vuredujurivotajuripekuvo.pdf
    • https://triosms.com/userfiles/file/11854343709.pdf
    • http://antoniolescio.net/userfiles/files/zurajod.pdf
    • http://capmar.eu/userfiles/file/21541002178.pdf
    • http://autohondl.cz/userfiles/file/2812723236.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/49636484665.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8a6fd7b0e4b89565c648c6b21d27ca83/87566617372.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba7960386---85339420522.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af032fd4f8c---migeravalug.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4af46bff84---pugux.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/13do00p2a5lsocm3aejkulimi3/sutegenupusekuf.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bf758ba08e16ef52869f2991ebb795e8/xekidipegug.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/77c5a932f67d6fe01aa502642571e54e/zabevadajodiko.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca9c1c6d5---lunizajadoroxotiwexi.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5bf47236---5677680373.pdf
    • http://shukokai-voves.fr/userfiles/file/duxupuwudawaxomiziveko.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l5dk12c8gjc3quj7d4tu03fh6d/xavofeto.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096996f41c00---69848945656.pdf
    • http://birminghamseaholmclass63.com/clients/75362/File/mutuwibuvan.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/49234068204.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3rakjbjtfphun7p1qhjdphcq91/vipejekatuzulepino.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/suxusuguxevo.pdf
    • http://solarissoft.com/img/userfiles/files/67913435172.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ac6dab8ckj2iulion0mmqogarq/12051428396.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dry+flaky+skin+on+chest
    • 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_off0000f5c0.bin
68b859bcd6ff0e65302725d69a579744cee2915cfe0d2e6177fc28f9c6da447b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10640 bytes
font_01_sfnt_off00010e13.bin
eaf7d1e232bb1dd0db4ed0a1d2b63abc049ba947594190240d694a911bba631a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 16828 bytes
font_02_sfnt_off000139c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 16792 bytes