Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f87696aacb250f…

MALICIOUS

PDF

86.4 KB Created: 2021-07-10 14:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d90917b03e4543b1aeb2df6dc7c2932 SHA-1: 75a63700db17fe23082c95f331f78f966bf3fdcb SHA-256: 97f87696aacb250fd531416b5432e48dc54b2c7d352c497a566c77652435a8aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The primary goal appears to be to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=cheap+trick+come+on+come+on+lyrics
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7871186ba8---88340265419.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/subikudakakesobujaw.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818d055e0d7---402108778.pdf
    • http://www.mostenpo.jp/userfiles/files/sovugegudowuwekoregukep.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/95702981203.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328d260230---9462711718.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/67398895830.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd9e94c7d---26869279232.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099768119b83---gatife.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f04664261---9127945120.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nibafuin59oiqpphl95svvqbii/furitudikofa.pdf
    • http://pospatrans.cz/UserFiles/File/44417540740.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/133ee31346a162c85f7baf0c1f900c93/17192353938.pdf
    • http://thayloilocnuoctaihanoi.net/upload/files/45006810492.pdf
    • http://superplasticizer.cn/d/files/jofapupezipagonaxem.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db59bab5da---77297472158.pdf
    • http://camionespanamericana.com/userfiles/file/sulivegowajegawupironut.pdf
    • http://andrelandberg.com/userfiles/file/72826048114.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/23bj98sd1m0a9mn99pp7v5d94o/78227816119.pdf
    • https://kcharp.com/ckfinder/userfiles/files/fimejagad.pdf
    • http://onlinetradeshow.ir/uploads/files/rediromuf.pdf
    • https://acryl-bg.com/userfiles/file/xudijimiraxe.pdf
    • http://dostavkaturov.ru/files/file/nubezubanomiwemorofim.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ad0a195---73659203876.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_off0000efd1.bin
3b26b30c4358d4b9a86afb951ce897f25498f233b0561f278bbfbdaf71f6623f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10876 bytes
font_01_sfnt_off000108d6.bin
5d63d92d486ea683bfd878979a59c82bf0a958ddec4ee4ea9daa0083aa3bb3ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16924 bytes
font_02_sfnt_off00013551.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 16792 bytes