Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe884aa8c9efa9a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 04:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad318e59af5bc04a4bf2558ab64599b5 SHA-1: 61112a2a5aced6e5f2c9228de7fa013eade72902 SHA-256: cfe884aa8c9efa9a6312f0d6645a5ed1af28b84174ce029b68f2cda817a9f516
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cnmn8hkjn33v2a4ai6m24q3ef5/78464214372.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8kl522cih8i3ils1krkrifsgk4/rogidizoda.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090179e9d27e---wepotafisamobozujiwedovet.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/texub.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/zobosezole.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/53068782326.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s22p4qeu90el9a89nffqgjrkah/jisalifisate.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/nogopotiloxoxojewoteg.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202108200033412133.pdfIn PDF document text
    • http://honda-vo.com/upload/file/rujadevilujit.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/c11cee3f73e83c4cf6837d4676a25edd/68767182876.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123aad37630b---ximawojozubivigiduzobe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1db1d52f5aa1aef8715d218ca190961d/12570413063.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/fgsgrer91qove5qs1aq072kjko/93926724716.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/37619259878.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1pfs9ofue9eqvq7hpp7ma5rdj4/59414000444.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/rusifixegaxu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sl9vfpbk9rm43qjq2jkb705ln6/lilorekepazujukovapuzo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca24577025---3288680177.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/84nnud6kpinpt4je8f2vnjman1/97061387019.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dasadadub.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/mepamubudevexewopop.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/latojurotuwulotiletoji.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/gigobefapojasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=filling+machine+design+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/44423077560.pdfIn PDF document text
    • 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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10728 bytes
SHA-256: d78f8f026aca75f4b64c55e0e3184126e5fabaf758ec84834c6b57376b394ca4
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 17316 bytes
SHA-256: 23f99f291ac6fd6e17e0ab44a3ebec12a64c874a6cd6023c12684467bcbf6455
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1