Malicious PDF — malware analysis report

Static analysis result for SHA-256 af43face6cf2298f…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b4853a68b1168edb0c728bd1803b274 SHA-1: 5cae9228b2720eaae429078971a2e687651b38d4 SHA-256: af43face6cf2298f1e755cc3da4fb45a448d6243d1061fc7f45806c807bfd516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=negative+effects+of+over+exercising PDF link annotation
    • http://peaceinsrilanka.lk/userfiles/file/topativul.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ccc4ad231---66363706192.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/65215209831.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e041eeee8---wegofedabo.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/balazumozurarinaw.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/kegigon.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/01c110dfc6de29d28e4a7e135653f255/fopemojerufizagabomob.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e1f143cc---pubovabewaraduxigojanuku.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210625210222_emVkb3Nl.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608765be293c8---98027665371.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/44979348896.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1116cd4623450d41e02a936955219a63/buwavule.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ghfbalcprtrmkhdi3bbpm40bu1/97795944493.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/765eb7ea17fad968c67273888ea54f50/zevifujilowabimipama.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cpe0sl0gj7k9jg48v1pc9t7tv1/95644853908.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/watudanux.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7hj8v5eidbmdstl1c70tsq5q2/bunowemosasofukeretefix.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fuwitox.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/296b73f8ffb0722860dc7a23afabbe1b/galet.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/28m4d8ot3vfvmn2aht2acue1lm/femitiv.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/71286589990.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc076b9c1---60933988131.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c7690f0e---dasifogakadetariseduv.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cea43921037---rezobakidenijopat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10612 bytes
SHA-256: b6c899b21dcd8867f9dc02d533ba0fc8e5e412302e37510586c3eac27ee0d19c
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 16112 bytes
SHA-256: 68ea4cc1087522d2529c670d033e771f5bdc1752dd2652693713bbbda2b596c8

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