Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1d27b6b2584bdb…

MALICIOUS

PDF

116.3 KB Created: 2021-06-21 16:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d8cd5471d411ecb7dcfa59460f6ec58 SHA-1: 14051ce60133cf0304eaecc85636878410323b73 SHA-256: fc1d27b6b2584bdb6a9ef5d27845dccc00281b64c29c07e8542eb7d8fa965b9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=detective+conan+movie+eng+sub PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160744821b65ec---92802124675.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b31bddc5f46---lofavomovasiforufus.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/72903464286.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/60219282089.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/kleab2phg36hntjbjh9691kskt/gunegogojaxekazaw.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/98949852536.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ad51f738---18138149189.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g61u4a8dgkr2g8rtdc91ch2bj1/defulitaxu.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/78674546677.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0106f0661603d9ca20283ff554bf61/mirija.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1lodi1hgpiu78vt5c75ua61k6/mavazabuwizefirakasumove.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7c67f6b24775b85c7b44b1d8d01b592c/6169228638.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210616022759_zkw02g.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/6819428692.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/919fa118ac4b09ced3e896d293d0af2f/97516470943.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/29496197394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 33408 bytes
SHA-256: 548a68ea9258cf58b5e8b3dd8fdc0c3252d0d44cb5daeca16810be47ff9a55c9
font_01_sfnt_off00016811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16811 5072 bytes
SHA-256: 5a0bc9adb5723a376521ef1d4677f453c49b1a2ca09fefc5bf5d2e6bb07933c9
font_02_sfnt_off0001794b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1794B 11704 bytes
SHA-256: bb4204c7cfd84d76c6dcb30d59de2f97814ada1afaf3d6d1e9d5f485749069af
font_03_sfnt_off0001a095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A095 16088 bytes
SHA-256: a0a5d356f05db46fa85cdf3a8f902cf85b482e5511f53a62d7281a8476bc9fdd
font_04_sfnt_off0001b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B545 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f