Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3090f7197e0412…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 10:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8713e418fdaec594ed223f778d3c04c0 SHA-1: 33cecd829823f26ed52ddcd77e663a8e0c7c7719 SHA-256: cc3090f7197e04120df23ef0eacb519b750debfc3488b9b6567de4906dbe110e
156 Risk Score

Malware Insights

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

The 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 pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as redirects to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://eyetracking.pl/userfiles/file/gewidukenupib.pdf In PDF document text
    • https://777mto.com/contents/files/5916760687.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076776f01fcd---50919757519.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d2a0842a1b1e7171e1a780e78338ab45/deresovudosalosajeju.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/50723e2b8622a2ffdec9db0e942a3af6/13414962712.pdfIn PDF document text
    • https://andana.us/files/files/72089543437.pdfIn PDF document text
    • http://geotersrl.it/file/63007227562.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ubqfqqhrdu6s829hh5oc10vvbb/69644480594.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e27745f5---savevodikuvomilemimaviz.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/37998138809.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/270d1580b0008004ec2193eeddf39235/walulobutinunete.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/91027347430.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0a62af3---24325887720.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b10e315aab7---wupavevapotewi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d917ae1f6f2---84585537863.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jozavubuno.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/87dab18c1e68746059a0686863e0b777/7949519530.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/9950599562.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/kaket.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a24c34206ac16f41d30bac265034571c/34549063382.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077918215707---jipabimabor.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/19780187669.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/15083141215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=water+resources+engineering+pdf+maysPDF 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_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16296 bytes
SHA-256: e2166cf4c3d2a7b60d67db6dd5cbf6e869b4ac7b6adbbd70e39e989d116c7f7a
font_01_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 11124 bytes
SHA-256: 9cde68ffae175a8db0218c641296475dcbb4b89aa77e55b7125f32c2d2b82469