Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db0d51bb80a27ac…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 13:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98d2575e4fc42a985b33d5c1f65dbd97 SHA-1: 65158f32fd535c7b7fbeccb4f4132b8683302fcb SHA-256: 9db0d51bb80a27ac7722ba93435cb99f883e205023ece6a9aa47a6a030fbd3da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://dewalt-naradi.cz/media/upload/editor/file/vezolurugoziwet.pdf In PDF document text
    • http://riverhouse.at/pcms/content/file/32443716771.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/66893982488.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e73f7fd66---74314644315.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zadisufekaxalukezobipe.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/98586939223.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/vigivipipipupepubuvaw.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/15525176369.pdfIn PDF document text
    • https://fratellifurloni.it/file/73132594824.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/35101265537.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/vexitivi.pdfIn PDF document text
    • http://getdol.com/page_data/file/susokepujo.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/37939071281.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/dimogiwogawabaj.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/pijurid.pdfIn PDF document text
    • https://partnermind.cz/images/files/tanasefakuselobakanim.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/53234073177.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/xawimimizewadodamotas.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3fc1e03b---19299388281.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/43737087824.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06f0b3f9c---wifofewoxugipo.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/keduzunazezabixasofi.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/61650552775.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/23753688026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+apps+for+android+for+freePDF 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_off0000bb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 10568 bytes
SHA-256: 3f7aa2d839677abf44f0150f9d56312ee9ac29d91d8717619dcb77d2c1555389
font_02_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 16736 bytes
SHA-256: cab6cc4626ea26d94a328a5672ecfda835ffe722ef0cd999cdf195548492775c