Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d3b218cfdca37c…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 14:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 07e8e16ce278860f91d4a4aa25d9375a SHA-1: 45986da24965ab4c83f083356848a22e08743ae2 SHA-256: f2d3b218cfdca37c70d141702e2247b5b57a1280efb2bea63a8e18d5ed7bd092
156 Risk Score

Malware Insights

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

The PDF 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 hosted on potentially compromised CMS uploads, with many external URLs. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133155fc3274---nazibe.pdf In PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/xasana.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/mutela.pdfIn PDF document text
    • http://esistore.com/userfiles/file/dadegipibedaxibubegax.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bitogoze.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/4309066232.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/37253336387.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/wujumibupupexememux.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/busadexarutepokazezi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8bd4b4d95d58f66d88c78c25201686ac/6477522721.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/fusutematarimanewirosixud.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/45781163043.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/84f9k51bpfe6khhq6c1mqthlr6/72286004284.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/16126549595.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/xajov.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/ranevanibasakuku.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/63360351366.pdfIn PDF document text
    • https://shibbirs.com/media/files/71873485635.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/97488860121.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/28454190825.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/14345984288.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/tajelisanetepagusiv.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/xidudububevapabumidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=c%23+exe+to+source+codePDF 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_off0000b0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F2 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000c3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 14740 bytes
SHA-256: 3bf3c401bd9c9eda8388860d10307834349ad95227719ddeabe532d03a0658b1
font_02_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1