Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf0edbdc6c1a1f0…

MALICIOUS

PDF

91.3 KB Created: 2021-08-18 14:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0bc63f79de80873db1af5b08934f5b08 SHA-1: 131c5211607cdfddc576e8f6592df03f0ebd1e1b SHA-256: fbf0edbdc6c1a1f08290a1a9a96db0c0a2d1aee9e165bb3acee2d819b3a0bd38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs hosted on compromised CMS uploads, a common technique for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1125654d---25357350197.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/aevvqdro5a5ekn7rs7q23522o3/revegudo.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/xajisepexogusifaj.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbf882506---94791104293.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/32598748981.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/mifomonaxividukiguguse.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/72b0d296e9b07cc278205e1cee002db0/94165099282.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5a1932f0ecf3979eddeb6ae1ac82cd7c/18710892338.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/31183772372.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/sujemesemuruguguzol.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/089dcf638bc58f73287754a4c288ae8b/68410993618.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a498208f---kilexigunapusisiwe.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a9724ccfb741496f96c3f078de691b5f/wofigonigebuzu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e28bjjd8i7oublrhedr87uddc3/68831854925.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d162c75b84---89064323042.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/5906897305.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/48597182985.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6ee8799f---fopiwon.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/apsmsjfqvkm9tsm6ago398i4i8/43826141917.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/35252256817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spider+man+web+of+shadows+psp+romsmaniaPDF link annotation
    • https://mediaget.com/userfiles/files/82804232425.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 20324 bytes
SHA-256: 286557216bf0fc8c01041789268ee79783591be5bf27c9b2ffbbbbe2f0755e85
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 17132 bytes
SHA-256: 1b43f2dbbc1af908a2b5bc8f01b5d6f4046fa26490c6d737f6ba1ca0e407780d
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 10920 bytes
SHA-256: 36f820bc4d3775218d7104c95e7ed9dc233fd48d165fc509fa2667fc91c14119

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