Malicious PDF — malware analysis report

Static analysis result for SHA-256 def7283c12cc6e40…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 22:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 029ecbfbb2d5e94d924a3bdeb0f602fc SHA-1: f33caaa2cbfcfb3a50869d8644a54c386485cec0 SHA-256: def7283c12cc6e40f205f603e7abc6b07e2a04e08706ad85a4834898016f56e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ltmetal.com/userfiles/files/bafilibuv.pdf In PDF document text
    • https://people11people.com/uploads/File/68821996352.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/leretegejirunud.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6c9cf0c2e6cfed3f86d91f2c54655ded/26168204709.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b96bce10---bavugodikisade.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/fugeririkamavag.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3a5c0fa7---vigunopijukodebamatak.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/nigumizagegaxodegok.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/xusunavaxigazukape.pdfIn PDF document text
    • http://beateromer.com/bilder/file/17933576108.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/remenutimajo.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/daluzitugoludu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22ba46f9c2ea0aac1f05c3692bb65832/70417215220.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/telotefabelirubalaje.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fitspfpdlc5j4aglpvek7r7cq4/14193574923.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/02950bd2dadfb3a81bd13748af21e921/sesujodetadedefagobo.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/23293115064.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/28267467017.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9g4oblndd2ps54qglj5rmpvu55/jamebuzujej.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0t16g8tjmauqdshniev08ojs69/dedojejur.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4db45c2d7ffb8cf0941b0d71649fe72e/riwoxajulopovurupekufava.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/bajibebawofapuxuxivegi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b19e53c9---mesuxujutavum.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210726051952_mjsu2v.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convertisseur+pdf+en+word+pour+mac+gratuitPDF 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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 19392 bytes
SHA-256: a9bbdf680c63f817bcb57075e69f21d7115c0c5cc18ac1affc704c9211ca1a1d
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 11200 bytes
SHA-256: 1deed68dbfc24b38d4e1f06f0742c616ba62d8122043dd86c739115119b0dbc8
font_02_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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