Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00991398b92369f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 09:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ba127e53f0a4de16bdab130ef7493dd SHA-1: 5d371ff81636aef61ebf58f27820829333798e20 SHA-256: e00991398b92369f7cf4443bfb36c1002c1c43b94fcd5823d496a6dd78d20498
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. It contains multiple links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF is structured as a link farm, with many URLs hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1cf438513cfe593d73b48dcfad0a7d9a/20110001412.pdf
    • http://world-green-hope.com/uploads/files/85841263467.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9254b71ef---59421748550.pdf
    • https://nezrenweb.com/calisma2/files/uploads/manakexutike.pdf
    • http://gartenbaukoeln.de/uploads/files/detujiguzepavuxafufarazi.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/11616545766.pdf
    • http://jgbt.us/pds/userfiles/files/90487074619.pdf
    • http://advocaatindex.nl/images/uploads/7102928383.pdf
    • http://www.smpnuenen.nl/images/files/xezusijijerigetigisufofow.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/viforiguvozufe.pdf
    • https://ratodua.com/contents/files/wekuwuzugidefigurabir.pdf
    • http://bachova-terapia.sk/images/file/70042548922.pdf
    • http://computergramm.com/userfiles/file/68419507245.pdf
    • http://shamayachts.com/upload/file/92972101132.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/12406172239.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cebfa02537f2cb2011d982a7e48dc8b2/93292748156.pdf
    • https://pui-vital.ro/msg_media/file/dikewosasuburire.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/manubixinitudeg.pdf
    • http://lsneotek.com/ckupload/files/29592370041.pdf
    • http://clinicaveterinariacene.com/userfiles/files/60228718157.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/sinikimorapomi.pdf
    • https://mami-m.com/Uploads/userfiles/files/36326904920.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=family+members+reading+comprehension+pdf
    • 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_off0000d2d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 16792 bytes
font_01_sfnt_off0000eae2.bin
3441ddec4c4a2f3560277e6d9b9683a8af4a8fa48e011e400f45db618205aa3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 17648 bytes
font_02_sfnt_off00011861.bin
a3593bc894c90fbc459682f5d4f0c3ee1ffbd3a6df13c9138a8e5124e2c0a7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 11200 bytes