Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc670df96e99da93…

MALICIOUS

PDF

97.7 KB Created: 2021-09-17 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25df2a87451780b449281a8f64d6c2f0 SHA-1: 5061008a95c2d0f830193dc0ad6d95521ae9aa9f SHA-256: dc670df96e99da93fa0aa5503bf2b92960fe876bf337dcf8316d9f2fa87cc7b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate that the document is designed to redirect users to various external websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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=apk+dream+league+soccer PDF link annotation
    • https://vidaleve.net/ckfinder/userfiles/files/vuzofajerakotofirepiwen.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/42766556917.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbffd34bb5---85303922868.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/34f799f1e7e238114e78de5a89552e61/59472754.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9f34e7e3fe89d6efbcedc23ebd0216d1/50117239943.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109010828304910.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b5e455eaa441dd7a8719e0a6b0cf5357/40148117320.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gfqel7ke0i5l4j64o768iimfj0/gazok.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zapaselesexax.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/99271303377.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/53843911130.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/54809847269.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210908123715.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lojelenukupidetowesuv.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/xekejoretugizelosusomo.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/gumanesarirerigurute.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/57401973471.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nemiji.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/pefataze.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/82538860112.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85025875817.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/45011421492.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091101090357.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 22840 bytes
SHA-256: 3da99a163f3701dd10a01037af63d3bcc39157ddb8a050c7ac126c54b37673e3
font_03_sfnt_off00016012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16012 10736 bytes
SHA-256: 40ebf9fca1552101621073239b00b252cfe9974cd5fc19af6e2f1c41887dc9d5

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