Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ba3805462dc1dd…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 16:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ac119f6aec7b2ff040950b8dc817762 SHA-1: 716ef9d98deb6a0b5779747307f1608fa2c54d08 SHA-256: 68ba3805462dc1dd8753cb1cbe41ba17dcda2593a72980a4ccf766b7c098b92c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f8e106aba---fobogapozinobemekapotigo.pdf In PDF document text
    • http://sparkpro.lv/content/file/xikuv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b7fa6d8d46d47350b13a9949a2638b50/juzavodixax.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29167611777.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202175344147475.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/89174401985.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/50630523896.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784a3a484bc---jebasatijuwozemutirezofax.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/71935942513.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210620035335.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/45621950327.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/acfd8305bbebdf3e5dbbfe55f88e2d01/15272922985.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda2c3674d---kelutobuvo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5202a3b2a6---5044622142.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/zogodisukilenew.pdfIn PDF document text
    • http://fygl.net/uploads/file/030955561799.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/tititasopapegi.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/tazebexedoxe.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/nununok.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fusagigexujakaputi.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/kovorigugawan.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210818_1BFFB7C18908851C.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jamesikunatuwited.pdfIn PDF document text
    • http://119pump.net/d/files/jutonibuva.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/nefolig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=icd+10+code+for+myofascial+pain+syndromePDF 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_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 10920 bytes
SHA-256: d8778a83beb4b81f50e4ce6f7fab6acbfb8a8b490872762c59b30c3b6804578e
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 15780 bytes
SHA-256: a93f77500a1832b73798bb549a6872f8243d56d9cfec3508d8391d5bbd7344ee