Malicious PDF — malware analysis report

Static analysis result for SHA-256 8953bd802b21d0e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68dfc7990d76ae1fa71159ab04b3abaf SHA-1: afbad93d7d5e354d6a8cf1bfc5f1b7ab73da9f2b SHA-256: 8953bd802b21d0e390ee5a9cbf9f74f2f86cac5b2bbff07298cd7e6f9c303433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=in+marvel+contest+of+champions+cheats PDF link annotation
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/xulonumip.pdfIn PDF document text
    • http://www.77ice.com/upload/files/65686909476.pdfIn PDF document text
    • https://atrax.hr/files/busajipadagopu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c6178ee4---fuzugokemege.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/teniseluwa.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/wuzaraxopiwetodorimeb.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161419aa1b4f35---tonafipudepufaxadelarufeg.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/kipogogurebawodoxaf.pdfIn PDF document text
    • https://maisonforville.be/documents/file/82228694035.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/99595172819.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/dagedumovamuzudot.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3a83c9bd---39362072399.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad978282a---88200752259.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/poperobefeferuxik.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/nelolewasumasekapozami.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/758532fd071920ee72ae766aa84cdde2/27897099901.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/denegebona.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/kewewukuzelepos.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/tufobokupujefakod.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/80464422458.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/genepetufuwakadazupopide.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/74625123854.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_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 17436 bytes
SHA-256: 87f6e98b3e26780a27a0082e3c3f98d4141ff520d98eadf858dc2d9999583850
font_01_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 10764 bytes
SHA-256: 4bd555c7fb14ab65c019010d46cb99aa04958aae70258e3cf1150c3467110f80
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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