Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9fcb9601a27b5…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 10:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711ca25eb697bea85fff7408b9f73a2e SHA-1: 4af77008d37201fe93a29d53242e283c765e79e8 SHA-256: 90a9fcb9601a27b5558dce58652ed79668452e8d2ca152a5f2cb436557a360e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is a link farm on disposable hosting, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lamgi.pl/ckfinder/userfiles/files/noxupobevumuj.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/gagituxolowej.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jeuhn4pasggpas67rtdkskceqr/zagiwomusoregogemaveta.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bdfa6ee61---fotovafidake.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4e7eabd24ed44e33de5fd31dc1200e6e/25916420492.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0743f7d6a1---10664913071.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/72f65c944d1ce15644e3e5201643dc64/49274219798.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/38361020903.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b459830746a---timiledujemivopixet.pdf
    • https://melz-feu.ru/upload/lejivoxedewume.pdf
    • http://absolutelyneon.com/userfiles/file/wuvofikejipipodesabitebov.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/91319531718.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1650a9b26---lawajijarafuxudupik.pdf
    • https://samngaimarble.com/html_upload/file/widutunururifebarojanugo.pdf
    • http://akinmedikal.com/uploads/file/mafuguvejusakisak.pdf
    • https://annekienlen.fr/imagesfile/25042644508.pdf
    • http://nature-revive.org/files/file/zovewizusirakeririgoni.pdf
    • http://csc-028.com/userfiles/file/20210606225635_0sng8j.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722fd554b85---raxip.pdf
    • http://adabaskimerkezi.com/upload/file/xufadeteweliwevemame.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/67348135454.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbe184fa8---58434878706.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=streams+in+the+desert+devotional+for+today
    • 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_off0000e8e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
font_01_sfnt_off000100f7.bin
fb39e5b317e8cefe3330cf30c9ac51dc2ad3c15bf0742981ada359ee60a09214
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 17216 bytes
font_02_sfnt_off00012dcf.bin
e8a4fae400295b317c7463faac87f53634027115d93b1fd98a10fe2aa50962f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 10876 bytes