Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c2f1b2dce64089…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 11:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b24423886c1235226c1c313546243a67 SHA-1: 0cf05366c20ee9b682d959b51845c451b7717710 SHA-256: 94c2f1b2dce64089415c8be7aff4ed7c46086100a06224d89165f2552d0dbfad
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cdmatik.com/uploads/file/vavisowomijigukovola.pdf In PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/41870582071.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/14978236955.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/55308212133.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908123604.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebab5779e---45632190840.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/11023722508.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/36330118370.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/42560190744.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879434ef17---funifigiwisimigax.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/eeu3cui1fotebbina72r7v6kfs/22877786123.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/71855420405.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/40092342166.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/43756005275.pdfIn PDF document text
    • http://szhlfz.net/upload/79844727908.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/96783967086.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/61561344227.pdfIn PDF document text
    • http://nemochem.cn/upload/files/farubi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gofuxidisip.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76014707925.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/82862210453.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wuzabofunokumololiroju.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/jamiraza.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/bosolopulanimaneni.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/letatin.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fokagilajisugufes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=completing+the+square+nat+5PDF 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_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 11108 bytes
SHA-256: b1619a9faefbc336a32f7cc2fdb2487cc9809ef6a3093c2f0c2639268b0ca60f
font_02_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 17216 bytes
SHA-256: ae8448d168c81444fe3436ba90a944836aa8dfb1a4ed20cb9d7b88d62b1cdf5a