Malicious PDF — malware analysis report

Static analysis result for SHA-256 841412a8f75aac86…

MALICIOUS

PDF

118.8 KB Created: 2021-07-24 12:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44e098362b6e9ca369eb70638adcc78b SHA-1: 4619ade42a4b982c082cd061f4f3b1fb98a9478e SHA-256: 841412a8f75aac86a84dfdcc93171c859dfa0cb611007ddf16e62867c43923e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://superpart.com/files/46704743310.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6c22a45c9c719ec0b501377286255f2/61928788498.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16271165542507.pdfIn PDF document text
    • https://campermagazine.tv/public/file/sajolosezetavazorerekopuv.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mevatabasavoxekiwupa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac23ad1c951---39994435241.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/v0mg6fph81t2uifrdl6gchj7p1/jutobi.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/1176744994.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566f39427b---15731783953.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2cb85542c---zepuvekebaririwexavorus.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e8b3c671---robefuvabeju.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/52701938896.pdfIn PDF document text
    • https://dintek.eu/uploads/file/totibasuzimowi.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/67790367677.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2873604b---33042357661.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a8b773a343b9f1de958c7c7a1e121e30/pilidege.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/74991173830.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e17a2304---nodovagusugipegisofif.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/fuxawazowiji.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/19546491169.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16078f59d8ef0c---88288181568.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/da4f4e6d2c249abb6318f8c625f97bf7/95122450432.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gumaduzedoziligilo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cee2c3349---97261520638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=give+the+ground+state+electron+configuration+for+oxygenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF0 21860 bytes
SHA-256: 4ef895335d46ae6b19d903bbacb6903b2f6799de6548d8e3f0e496fbdd37f0d6
font_01_sfnt_off000184f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D0D 11176 bytes
SHA-256: 31c13710b45452281d0d17c1a4d49b71a8f4375bd6f606f63298b77e6ebb929c
font_03_sfnt_off0001b707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B707 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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