Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f209d7b7e43c09a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 18:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a425b3d3e5384f2dd6f3f6cf7d071603 SHA-1: 85b98d511e32111c5c1d5fd2c709e2db35908ab1 SHA-256: 0f209d7b7e43c09ae73d14c9d8a0413494d10d3574457a404cddd15b8306e75e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of external links points to an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cz-synergy.cz/data/file/9194561161.pdf
    • https://panelshock.com/userfiles/file/madodofidiwobavedi.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c8d0221316c71a998345df61263e76a8/kogejeva.pdf
    • https://alsultantrading.ae/userfiles/files/75222726388.pdf
    • http://mindentudor.hu/userfiles/file/xejujuge.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2942a84844b0c814c0a5d8dca6eedf5a/46248599303.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pomarekuxopenabizin.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c3d65c9c---66688064287.pdf
    • http://netflor.pl/upload/File/jivefofozadeneb.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6aae93aa6---91450496834.pdf
    • https://cartolmania.it/file/jepagupa.pdf
    • http://allasclub.com/campannas/file/56331851469.pdf
    • http://lagostena.it/userfiles/files/39727985614.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ce6f23bbef33b02ec80b0cf889f7cdc6/53337026166.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e7ec4dceeec15d85a991541a7da72dfa/pefipazukesavopul.pdf
    • http://haustechnik-hagenauer.at/ridenonemovepen.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1f8e6a618f063be115b3879c5bf99c24/xemazawamilugokiji.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b0a64e28d0e42c1af6a4443faf4ec595/buxamalemaw.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/68233258467.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hm43lqqdk8s8315n738hug6uu3/worovirafuxuvad.pdf
    • http://4seasonstours.in/userfiles/file/58111879998.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1ljbkk0lnqv302iscdkki2lh54/58151284739.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vbspu+new+time+table+2018+pdf+download
    • https://lapdonline.org/file/33024099644.pdf
    • 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_off0000c11f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 16792 bytes
font_01_sfnt_off0000d931.bin
951d26bd38a438911e0213e8c60d93638b963799a833dd37af8a7f63df9d1453
pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 19340 bytes
font_02_sfnt_off00010aeb.bin
cb0cd09b0816dfc76cb49a82e62ce6e8a0336454d95ca838900177ee6e54c649
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 11356 bytes