Malicious PDF — malware analysis report

Static analysis result for SHA-256 6684731e38baab2a…

MALICIOUS

PDF

80.4 KB Created: 2021-06-30 01:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 769475dd98f470b6961e4ce421245c20 SHA-1: b9669262cfb048f545610951944ed23c37ef8bb9 SHA-256: 6684731e38baab2a75915b61bc9f9b43df7c62a7cfd8d6daf95d4b1866e74f70
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs, many hosted on potentially disposable domains or compromised CMS uploads. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://chcial.ru/uplcv?utm_term=minecraft+villager+jobs+and+workstations
    • http://tivatijapan.com/uploads/userfiles/file/77394687020.pdf
    • http://rasmesafar.net/basefile/basefiles/vugovexurekakepem.pdf
    • http://travellightnepal.com/userfiles/file/39808387690.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/65795009211.pdf
    • http://www.euro-fly.eu/userfiles/files/foximenekize.pdf
    • https://samarpanbharat.org/trila/userfiles/file/jusaj.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/17525112999.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/209600fdb06e782ce8a3f7a05054cc1a/17979911163.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c829d762da---8897949630.pdf
    • http://abogarestudio.com/userfiles/file/puvivuvejukiwedejebut.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/deab82c06c28d557e835038b59b93ca3/vefifatowa.pdf
    • http://bocghebinhduong.com/media/ftp/file/sufojuluvuxobaluwavusox.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54b873b85---vebosemevelujowaxufe.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085d656e1005---11647023449.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b93c828348af2cb49f7b9f9ddba14a71/62700447092.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e4162f7d7---razizilujokifakopetig.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/319175d44a6357ae0d76ec3f393c5b35/58213176417.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3b96ad9dfcd960303955d4f2b6a2acd9/lorofibinikovap.pdf
    • http://arci-mp.fr/admin/File/vezavujexabifuwatulubige.pdf
    • https://xn--fiqa735be48e.com/upload/files/29558324740.pdf
    • https://akemi.ro/hirek/file/julosikaxetij.pdf
    • https://ancoraeducacion.com/images/22440625771.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf19bc8b14a---25449825598.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2684a9b481---xatawululinivukexikomi.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8b02b144---duselejorokeful.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 16792 bytes
font_01_sfnt_off0000edb3.bin
57fa901a79ed8442b14481632fc6f99f672cbdc468850f5ceece18f13e73229c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 16856 bytes
font_02_sfnt_off000119e3.bin
59f8384e1e41051099658070bcbfdf7a2ae916779dd9f91ffe78cce9879f0879
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 11156 bytes