Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9c66705f738e48…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 12:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f50096d04b349a2276201311b5ed3a8 SHA-1: 2808eceaa4f3a03a41964aa28fab39f3824848b0 SHA-256: 9d9c66705f738e4837fa84ce61cf93f709db6d17dfa12bbf0ef743d70104a2e9
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links indicate it's likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://svsteinfurth.de/radsportfiles/file/43570301931.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4dbd897b---beteten.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c53a11e543fd2a56b1a0485c2b3af492/visef.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/nikafalomikudodig.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/larodutigugapabipiba.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/malisidupive.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/84057443598.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e8e1f735---wupepefiwizezijene.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f8dc784c6b8e9d1578deea32f18b3927/rusabuwanitakilemezinam.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81a16d022543e11112a9e46dc9afff16/53488603048.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/42215862428.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/31b8fd44cec7e80bd83153eaf228a9df/13854230180.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309276c049---29388932293.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ap27o4b3a4ccvcki7t56rldv41/42476491211.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed96172e5---lulubepowefamutajokotu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b428bddd8d5---rewusogofev.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/mezifolinibolaxad.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/17696496016.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae86b20be4b---87232737736.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fbd3f5c4495e0e2b01890451c7db61aa/votomopikofujijerajimopov.pdfIn PDF document text
    • http://contextuae.com/resimler/files/kosulunubifebaroxapizi.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/11021973522.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4883a99c1a---40545244679.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/94139953328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lewis+a+coser+conflict+theoryPDF 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_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 17884 bytes
SHA-256: 605d94425708307b3a754c293bfbea95c0ec9a36fbde21f3a6e45f00667548cd
font_02_sfnt_off00013fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 10588 bytes
SHA-256: 615bd7a0f1059cd047bd53e56b4432e7d2786cae4ba46caef88d3750d0799d58

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