Malicious PDF — malware analysis report

Static analysis result for SHA-256 3879a2fa516391d2…

MALICIOUS

PDF

77.5 KB Created: 2021-07-13 20:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c527fb59dec0ae969be55b9ac6ff81fa SHA-1: 054b3817cf713a146b00ad6eb6f191ae38e60941 SHA-256: 3879a2fa516391d285e0a86199f4bca2dd56771b4d81bd772fe7491d85a640d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://timebank.ru/sites/default/files/photos/pagefile/29840129523.pdf In PDF document text
    • http://terralis.eu/catalogue_dynamique/file/bakitivenisaxo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2np16njll3ugl3du61ta7ls0f0/wogapigixetesiwuj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fd9932f5---73383683182.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f1ab77d30479fe05a0754de0a392b495/nowum.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be889da595---vikux.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/saxebajimebogaletisizoze.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210612_D752F45E812CC641.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b7f243dc0---29393361163.pdfIn PDF document text
    • https://parfumzone.ro/files/file/titejeguxujarolugiwo.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/pabimu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b92a20ee---91888150404.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160e352950a5db---18882670502.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713391a8a0c---saxiwis.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/21615210901.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/kizurawasefatagusuwebopi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xazobanetenebedolelixib.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/ponuxonofalasuxagituded.pdfIn PDF document text
    • https://j26clean.com/upload/files/bujepig.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/1167151138.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/56943865939.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/209b294d35457ff69572d8671add97ea/valeviraza.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/97kcdcrjf1mo4dqa9gjl3brh4o/zunetu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/gvoqilna1e3855f9tt7qdg0jhe/97702544793.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608300c817fac---wilatejegujuvujagopenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=falling+in+and+out+of+love+armin+van+buurenPDF 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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 17432 bytes
SHA-256: d7f3516d914ddf4ceb8ee1d396ccba9f064e62ce4d73d15186837e1b976e4d10
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10812 bytes
SHA-256: 9eff55f80fd7bac480f3f84ba2b0aba5c36270a7521afc5ba136771ba63c10f1