Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31c38fcee2cd004…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 15:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a79cf839a2f9ecbc9c2c495a5fad2d9 SHA-1: 674602ac19b48f61edfe693b19d75565af869280 SHA-256: d31c38fcee2cd004371ce05932c7d55f65999140004195a18244e682d4e4e112
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://specialcats.nl/media/files/94585448814.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/gujelekitetulobupatifosa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/eac965ed0612d5d1b2f48f308ae96864/73683953250.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/15419304405.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nidokavejararo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/utrd0ent878tspgccshegpne03/15610854870.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3f5cd8956---bazubagudanepapafapel.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/refajotugowozum.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/dorevexi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6753e863---kobekutikami.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/nowiwudena.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a78og3puo2jbalhik7gcpdt4tq/zewuzoxetaxobarib.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907233133.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/jolibedevojenixalit.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/sofuwiratikekufamimi.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/wuveko.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/doseradixexegakogizakise.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd689f92c---xururizoresivebifexobuzok.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/50668708901.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/bolekogemun.pdfIn PDF document text
    • http://onutglen.com/caningest/images/file/sopesimifukuna.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/90796764180.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210923_DD100201CC25CE99.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=excessive+pride+meaningPDF 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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 16068 bytes
SHA-256: b400f578246c019dfd7b3843cbcccd5d45a8af303e5ae208a9777aa5148f1a48
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10744 bytes
SHA-256: 0dfb04d655ac55c61eeaa6caee264b8fe5248c37abef169f92096a6f8c0b64b9
font_02_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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