Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e97127d96b98f6…

MALICIOUS

PDF

75.9 KB Created: 2021-07-08 04:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f5b9cefd5d8f9effe0e102a76606635 SHA-1: 62106240949d9e2e2a33433595b349fda284ebce SHA-256: b7e97127d96b98f63df24961cbbf7a395ee358f8364b56fc5d8ad67143278de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the structure and URL analysis strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3eb5fe9a---52900447920.pdf In PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/53185715125.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9e217f3615dc4cc4d31a30e7a7bd023b/86742600111.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1nit5rs9ea49uddoa8kf2asdrj/viloxeredugatomewaxa.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/54d6ef0d1f74f71f45cde512606a5d22/pezobitegupigawojisunoweb.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/2476953729.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b456602d706---5940441553.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bms82ame6nsgrqk2h67drjbjlv/xufuduruwokabukaxom.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729aad4edb---10111812554.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/pitin.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gl9dvbv0n1dkqvr6bbuftjgats/61693818598.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/4434536755.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/vomalapibelemabamas.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8e67a178---10531053045.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210522162168353513.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/vunonuxajizofow.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/52611879269.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/539ff19dd6eb42089267cd3942b81592/zunafomabogovobovolarafus.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/80a1459800325ff36262232e69fd0aee/963829997.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cueh3t8ahrtkncpofnt5p0rblj/sukiru.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160790d6c43556---toxujuto.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///kititagur.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/valimakujoxebirigofubip.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8da6634b3---poxepodurubaded.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983425bd32f---xelaviduxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+total+number+of+d+orbitals+in+the+third+principal+energy+level+isPDF 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_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 15268 bytes
SHA-256: 491d81054b0f98e2f80ef6076a715ad10017ed93d39d930e0bd09a4d5869ec61
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11448 bytes
SHA-256: 482420c166ef2355d6f938dff4796bc03ed25abbd6bf1d8131c44b2ab14ef267