Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc38c765766cd9b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 21:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1841817e67f74cb574c5603dd9773ac5 SHA-1: d7d55f1f5334994b63f908f5b02e9f590dea72e6 SHA-256: 8cc38c765766cd9b7bacfd0ef8d28f7dc4f8ebd79252c836b05538185506ca89
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unsersohn.com/images/file/48795794052.pdf In PDF document text
    • https://open-call.fr/uploaded/files/13674971301.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/67142050679.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/daketuzikewudemar.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/juwedepasebajizanedak.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074362400ef5---busagijavunofibedu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/53874200438.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/virogenerobam.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zogikoxibiwar.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/59943259045.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/9523146258.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/tiwuk.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dd988f4dd182c3f3fa3426756754b77e/jujaxunimepipole.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/73480661126.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/vibulumekoxatezot.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f3f4eefa9---zawepotekup.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741f136c9fa---27646075593.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/xazofupidokuruvitevakili.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///titoxozanime.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c987c5dd01---muvira.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b278c1ee7676cc7ed42465699fef53e/15595147660.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/71814731528.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3ebd2fa3952867141446dab37aff5baf/59118241540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=would+you+rather+questions+pdfPDF 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_off0000bfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA8 10948 bytes
SHA-256: c0e6e59bca6f43aee99be3bf1d56642d0c625eb574a26f1b90a4926bfbddb503
font_01_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 15872 bytes
SHA-256: 47eb7ab3f0ac364b5f82d1ee22bf7c583da68dec9ef48440ce7a4af1edf545f9
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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