Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e9ae040abe7562…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 16:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 33f47bf376bf64541375d1ecb420f1f2 SHA-1: a22e59ad1b1d84aed8517637d853436a7fdabc07 SHA-256: 99e9ae040abe7562c7dd0228bd1ffb8db95cfbbd20db63d136745a38b7586038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing a link farm structure to direct users to external websites. The presence of numerous URLs, many hosted on compromised CMS upload directories, strongly suggests an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nomylo.ru/uplcv?utm_term=vertical+diet+3.0+pdf+free+download PDF link annotation
    • http://jikaramen.com/uploads/files/bidowerawarepozafoxoru.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/12a6e53ab25e3c2282c65a1fbf061ea9/vokajukenip.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/gewofegesaximi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/72449683151.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e03f1f30b74---35234277473.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102de87e0e9d---85029690222.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/kopisipe.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/77557367737.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nvm18p4n1tlml56cucthjgc2b3/42550314484.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/nexadifodususe.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/93632862545.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e04bad304fc---faturawonideriluxupuwen.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161071b6c20560---gukumezujumumiza.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pomezixusazopuvip.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/58206218195.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610f18e772---mujuwalilisesemo.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/segajar.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7392cf2fbbb935bd13c145479ecc039d/44956178567.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zexopamivefibobibuxore.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/99892338570.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/magez.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b72c17cf2---72232774285.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jilifumagudapisedasesak.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/pelimino.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759013ed25b---13340443513.pdfIn PDF document text
    • http://asid.rw/userfiles/file/70695806803.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xenaveradasixupid.pdfIn PDF document text
    • 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_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 10860 bytes
SHA-256: b67c4dac752a6fd315264352ffbb5ada5e23bc17c5988fea38f26b5aecc4c305
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 17924 bytes
SHA-256: d6aba66774d5f2fb0f1a54d347c6a52a552a4d84698e816d41a28c35f2246727
font_02_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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