Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18dd31bdf167c22…

MALICIOUS

PDF

129.5 KB Created: 2021-07-19 21:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc17c407e3420c0a984ef2106f107a02 SHA-1: e0160f8b92e593c3f4dc0a8f1c4fc328a447668f SHA-256: f18dd31bdf167c22178eb9957d2ae7ed34ed2cedb68777d0b95f96c8c290baa3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple links on compromised or potentially disposable domains indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6fc3f8b74320091e15b87225517ddf06/jimatamo.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/girifotarib.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b5a77da---43351707899.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cpdr01nnrkd8u651eg9nufap8v/wipowarabawuramoxaderamu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9625af3003---72462354652.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/psosndsji4up9kggpjfsgveaj4/josarir.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3a16c0fe1c0e2c174189499baf3d1b7c/63287161358.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/61525718330.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080609094190---67640678793.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6ac9ae98---kadotanolemokagawipop.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/69665570945.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/29626925225.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r0irvi4njlm4nhmn5qh1suomko/neloxonazebi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edb129b19---9164977258.pdfIn PDF document text
    • http://acril.ru/ufiles/files/83571267803.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/fivuzi.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/34368673542.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/64973591879.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/56364593463.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/pagitatilozugopopike.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/15305681106.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/jululiribobipegejifulotoj.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a776413f9bf---fokebezaz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9683351f6f---laxesisezudoli.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///tikajoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+principles+of+stratigraphyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19797 10836 bytes
SHA-256: c0ce08ca4926bd2cf4c08e4cf479267e6aa11201c639a35f37f7aad027385715
font_01_sfnt_off0001b098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B098 18408 bytes
SHA-256: 70bce17e19928eb7518f6199eaa65111e5bae6e61beff252459c517d29875aa2
font_02_sfnt_off0001e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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