Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbcc2805c5906b2…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 05:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 125af36cc2ed249a355b6acc34369510 SHA-1: 47e211dd473f59b81320ffb7269290f910e69c36 SHA-256: 0bbcc2805c5906b220e27f37454c4e81ceaa7b032fd34aae34cc4d064999b470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malicious redirection scheme. While no scripts were extracted, the overall structure and URL patterns are consistent with a phishing lure designed to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3a431008b---11646696779.pdf
    • http://ilovemynewstemcells.com/clients/865932/File/32947737340.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce43eabb0f---40284500748.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/caa72ae41c745c9809740be0f996486b/zezodasemobitizef.pdf
    • https://avenue102.com/uploads/file/756534564.pdf
    • https://planet-for-events.de/userfiles/file/55974580846.pdf
    • http://tbm-mova.by/images_from_html_editor/file/lurolajek.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/7e1f9251d879c432de7a82ac7b50b306/sofajegenejofoz.pdf
    • http://prodottoitalia.eu/userfiles/files/99795686301.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e363d2a758---jeselogituz.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gf2fqt09s827d73h2oiovi9o0/zewamurusifu.pdf
    • https://hometeamcorp.com/images/usr/nagubebuwigavananupuzi.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/26d84d0d501a2f1beed9fde4950eb607/jubojokarinisuta.pdf
    • http://aldo-ins.com/userfiles/file/16236301333.pdf
    • https://debcopharma.com/userfiles/file/33969943145.pdf
    • http://umiyawoodworks.com/fckdb/userfiles/file/vanipat.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d56d4023c---regupinivaxipekube.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/838262da3ac3547ed8a8c07bd2754288/95284069885.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a090ee045---44686130172.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nb4ek8i78oe1onvrakmg2l9ct0/wovaniwusaxezaj.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749b3320486---66933492920.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/385722a6f87daaa64bd5dcc39ca968e2/5008411146.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ab8794fe5d8c5e1cd93b1dddecd1a5ec/76419759373.pdf
    • http://ddservice-bmw.pl/userfiles/file/31077500173.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+contemplative+prayer
    • 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_off0000e90d.bin
78160a2394abdead5196b26ebe08d5c1cce8dfda1bb30c26c178bd9a42dc4178
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 17992 bytes
font_01_sfnt_off00011620.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 16792 bytes
font_02_sfnt_off00012e37.bin
3708021d31a3a5fc901b7312f687bec35566081ed9e78019b85bd8ab6fef4c1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E37 10812 bytes