Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b41f88ae72a51a…

MALICIOUS

PDF

90.9 KB Created: 2021-07-23 15:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5a782e5958453c29e924d262989d08f SHA-1: 36f291989f3b861bc2d6afbf1b8ab75520be471c SHA-256: 23b41f88ae72a51aebdc3f1ba04757f327d67455fbb37b2d9ce4b37500b98528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO-based attack. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699969f6fa---bewetifitasajotonida.pdf In PDF document text
    • http://ferrocom-spb.ru/userfiles/files/76355140555.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/felekuxubugifajopuk.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/dovovoxuzaxonurepuwozur.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/16506325693.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/41520476592.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/26654649747.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/kuvaxerawomibawowiba.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e783db0244---kisijodivefisinitivurus.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/puxumipemibowewoz.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/73604201479.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/vokijineselizinukenipetab.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/685fdb7b6e8d7a1ba66eb37e623afa0a/sopob.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d4fbcf1971a36365e20a550b364af6e9/natobolipovelowadaxaro.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5caf98c84a---29081846659.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/r70ghdpbbl37vtcve7k0jndn81/bagidifedobezobi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d440a4fc74---vejikasatirazi.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///61722504673.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/9272685556.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/32758419344.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/riraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+6+figures+in+6+monthsPDF 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_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 11052 bytes
SHA-256: 9dab4bda1d2efa77118ab4efe82e06fd6a8dc45feb84146f81ea75cf2c011afe
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 17356 bytes
SHA-256: 7f4c21a61b91d385b3b6c381782069d4904534b64760fc21a93cf7fac5669d53

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