Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddafdc21c788042…

MALICIOUS

PDF

99.2 KB Created: 2021-07-23 01:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5e21c5e7af0582c44b5b36e8d9ea33b0 SHA-1: e8ab26b3578f262b1633bf8bd94501e46d5369d4 SHA-256: 6ddafdc21c788042d2e2e7246477efed4ee79ac3035e0425cae81a9573de0554
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lead users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080435a761b7---92501338585.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b5f0fdea14393518010c0bc7671e6105/60245675518.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d2693d151747bcc74a7650de070712bb/tifezevekazowo.pdfIn PDF document text
    • http://aurora-c.jp/files/files/50966638575.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090271321a2b---64514072725.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/28390301953.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/24325066307.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/sisumokiviwiruki.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/83389676276.pdfIn PDF document text
    • http://954move.com/clients/4890/File/64210411831.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/93801987889.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e215103bd---82677969399.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5gdbtrf8pscel1no3sbv2ms7tv/84525954748.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/75942067779.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gininodulememes.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac345266e2d---mavorifezabalibivetixujim.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vepebefosofebevalepu.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/zuposu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d719a8469cb7e487dececc84275336f4/solulefojamikelifirimidi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wakojexowo.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/vasomosudigobagit.pdfIn PDF document text
    • http://superpart.com/files/madatuzeviropibo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834e207787a---gigerutedazaxugilel.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c750cb42bab---73809879700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rest+in+peace+message+for+my+sisterPDF 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_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 18992 bytes
SHA-256: 093f30c179f6079944fa81a3ce2700cfe4ef3a011f52f4f8e9d8de8147e69997
font_01_sfnt_off00014d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D76 10936 bytes
SHA-256: 9d2c1030f704c652ec1e07fd17294193c72c266e7e2b2d15d43b3cf5d98945dc
font_02_sfnt_off000166d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1