Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f40b15f980740b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-22 13:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71f8f7c85426c5bbd6e7c76a535f0a2f SHA-1: a45eea3a947d927c0ff0978eb1ee44dd6696bddb SHA-256: d5f40b15f980740b2539f3a16ba7ea0d8991eee86d4c72234e0c13f272a77063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, with numerous distinct hosts and UTM parameters suggesting SEO manipulation or phishing lures. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160970691de013---40346478677.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gmiih9f27cj42gdofhgufke86/78008811786.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160838da2904fd---gapipevumevi.pdf
    • http://romanakladatelstvi.cz/userfiles/file/32699578811.pdf
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/4148587967.pdf
    • http://diamond6ranch.com/userfiles/file/tadabexawijokotiv.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d600bae4fd---kizofinidinakofepo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qa0mnkg2gp8573fhvqlc07ls0/56753540923.pdf
    • https://franchiseharbor.com/files/files/gagekowesezetis.pdf
    • http://mixmarketing.vn/upload/fck/file/80540450092.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca7cbf4f3---tifufarajaju.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090827d559ab---xebalerekozosanav.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2cb83d8ac53a2be9dcfb5f6197983a56/12654820419.pdf
    • http://birnagarcollege.in/userfiles/file/jugarexosumukajabozozetej.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ae339c36f7576e4bbf15a8bd72d5fa03/nukofelipejofelo.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43d72fb2dd0ccbef05458282e8192832/xivuda.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2849edf8901fb6d55a07a467c2ca8aa6/xabovawajexu.pdf
    • https://idd.no/ckfinder/userfiles/files/48563881929.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/15156005308.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5e7f49b9755a4d2ef0a046d2477646f5/9480884396.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/radubelotatikatujerig.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a82900a79---nowazezow.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/08cc8343bb3352c0fb0ba827c74eaf0a/baxevujotepij.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077447e1e7aa---muwegi.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da65176cce---zenizupezudatuwisizoxupe.pdf
    • http://euro520.net/userfiles/file/1620947308899891904.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=solving+solutions+by+substitution
    • 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_off0000efcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16792 bytes
font_01_sfnt_off000107e4.bin
a5f172bec984b7f06ced571047eae9a0a508cd7e7fe1398087386e6b883058e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10384 bytes
font_02_sfnt_off00011f80.bin
6aa408891c09c81577ead80bc36da7cf7d6aa6997ce9d362f52558d001aa1287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 16592 bytes

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