Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5713c36c24fe4c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 18:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3bf931ebf66d6e781d4f29c7faebf4e SHA-1: 61c5ba7cf3a4174055911eb4aafdbbeb55ec0fef SHA-256: 8d5713c36c24fe4cc55cbd1b646a78a72d954bbdb93f1a989fee47113b9e20a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term=pay+with+phone+nfc' in one URL suggests a potential lure related to payment or NFC transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abw10thstreetne.com/uploads/files/xitagawebugulowoxepefe.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/af7329930f2f1a3a84db0500b8466e2d/65338287361.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/luwakepovikavus.pdf
    • http://pc-driver.ru/userfiles/files/66731409575.pdf
    • https://bititechnika.com/uploads/file/rekijowokizalavod.pdf
    • http://www.logomarcanet.com/userfiles/file/93051802369.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/sotuvapuluwimi.pdf
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/nekogajigi.pdf
    • http://esistore.lu/userfiles/file/wemogejoma.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qkack4q10jn4n976fe7h7l67ku/porixibutixuwebemadeka.pdf
    • http://style4.allwebeasy.com/userfiles/files/nesoferuzunoxuveg.pdf
    • http://licausi.it/userfiles/files/pogiluji.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b17e78063---videkiveruliwuvibukabimim.pdf
    • https://santechnikosdarbai.lt/images/files/66805480017.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453fa585967---namofaxufilif.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd2b2774d---gozeberowowekevun.pdf
    • http://wish-pharma.com/upload/files/nigewog.pdf
    • http://eros-arena.name/eros/userfiles/file/90388014994.pdf
    • http://leylatoprak.com/userfiles/file/xezajumu.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/duwuxesotidinegu.pdf
    • https://foodexgida.com/uploads/files/liganenowevanos.pdf
    • https://khmernative-rice.com/userfiles/file/83185957882.pdf
    • http://gramercy-grand.ru/files/file/wemajilowopoxerifetanifa.pdf
    • https://dongciao.com/uploads/files/202109171505105995.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pay+with+phone+nfc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 16792 bytes
font_01_sfnt_off0000d625.bin
4b3f728c872d33e8a115058b0876fa33a224f4ed57f719332f92d140ec30c1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 15756 bytes
font_02_sfnt_off0000fe40.bin
20495bbdd528094ac13b315db2e3c5a3b82e99c3d20b6a72ab64c801ea0520a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 10464 bytes