Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d877c59c83fbcde…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 01:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52a2c4a998fae89850323f3c7595235 SHA-1: f5bb226acc175e422dd18fbea7b9986bc4d4321d SHA-256: 5d877c59c83fbcde9f160cfdf5d626270d3ad7a26eda5dd69baae32a7cc670c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and embedded links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a34f36b4b0acec0d873bee63fa1216d3/rabosesopojoje.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390785d192---89755153900.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c15acd011e---wukazobis.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a185762a1---xumataguwoguvozizijesape.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0618d39c---19686053648.pdf
    • https://iamtimeshare.com/userfiles/file/xapezipururemuduzuni.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089be158d80b---62128339208.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/055cdabb1c74b336b773be9718e3d6f6/nufoxaxejasogiruresub.pdf
    • http://dambi.pl/userfiles/file/popije.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21fc9566a0---subawikof.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1c69c42---45144678881.pdf
    • https://lamthong-marchph.com/piceditor/file/42493428227.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/p7glh36i76132dmh12anj3qao1/savenovisexes.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9197243a---masema.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e1fbedbb---49316384290.pdf
    • https://alnahamgroup.com/userfiles/file/4415077713.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d29a9b17a---gadejubaros.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gmrtub51m0ogjdsaar66g3f8i6/74224157806.pdf
    • https://stvorki.ru/files/file/15694226315.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d37574db181ae6e389e95278d147a2d7/nefatuduta.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8f0c5843---18407858474.pdf
    • http://ranaghatpchsschool.org/userfiles/file/govejededu.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47678864023.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf99293b19b---16745065001.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b2a8579c---24193990413.pdf
    • http://usaoxin.com/userfiles/2021-5/file/52980380883.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ec1b808---surupemofekigazevaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=five+stakeholders+of+the+business
    • 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_off0000e7f5.bin
4d41b8e19f68d00ac449aab963643f30bf7a2520760aa3fa316e650980f0c3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10824 bytes
font_01_sfnt_off000100e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 16792 bytes
font_02_sfnt_off000118fa.bin
d99b3c113b68e8d5267626a9b3737cc0af8e7110cf97a1e780347158f170dc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16472 bytes

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