Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dddcf6d53045d9f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 16:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edf7f7d27c698e9b569188d501b1503c SHA-1: 40fba235acd5b0c9a1f59555c1de84c07894df1a SHA-256: 1dddcf6d53045d9f77845b421883efe13245a7dc4702a5f127dd7d6c97acf009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to create a link farm for SEO poisoning or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=the+environmental+protection+act+1986+pdf PDF link annotation
    • https://bselink.com/userfiles/file/kekepevutepu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26801f533---4015668611.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/n5ajquvt0srgjplfbtqspqolhn/momemafododokefozilobisew.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe77355ece7aeb858e3420574363e254/71890266785.pdfIn PDF document text
    • https://areicon.com/images/file/varutedefekofo.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/96356514590.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7456fca022061570a8631c45646f90/dumovojonemiwomu.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/56752576122.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/2421431600.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wepapezazufagomo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0eg2rk251l60218mgl4fnsujeg/52369254308.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90c7a6fe9---67258525102.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/pufulawileje.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/fafejefofan.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pomizazebekodavatiluvo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/wolifujupogatatifij.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b94003e2---77213246702.pdfIn PDF document text
    • http://kingnature.ru/files/files/bapusuvetasobun.pdfIn PDF document text
    • http://weingut-suppan.at/files/zabafewolapuwazuzuku.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/talemejonudibekuxoz.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/nukosus.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/76826bdd48087912897293cb9d0b5f08/29285556590.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/19405589559.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/wotano.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/30900395282.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 11344 bytes
SHA-256: 9461caca19160eb1ad23b401396c9e6e93382c954e94ca4c597c8aafdeb9a9fd
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 17420 bytes
SHA-256: 468de7d1a5de15bc5586cea6e8804613694d1b55e069e09c31626e0bbdd69f4a
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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