Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8e0576036b44f6…

MALICIOUS

PDF

84.5 KB Created: 2021-08-21 10:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 072969298ed44ed7a7b9afa7f3ebe129 SHA-1: 32eb5a64032aeb67e177b22719504a1b54d0cbb3 SHA-256: 2b8e0576036b44f61cd17d091bffc53cce70dc505aa99f4fad3f5e18e9f4133f
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 upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tukjo73mba183otqkrfvpv9bk6/lixabisebewi.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4isbf6cctsmdf7dci67b93hi12/99857745347.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/77444208690.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/99481221496.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/vuvexamibewawegipif.pdfIn PDF document text
    • http://classtool.info/upload/files/93518838902.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/9208705149.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/kofuxemilufi.pdfIn PDF document text
    • https://profesa.net/userFilesfile/85380083967.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701aa70afe0---87265630892.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/kemovexetokimoduzu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/vikuxojewojoropunojujoke.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/vawelejopa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1sndi4hamterclpn0q55m8fd7/dovupirekafojovifo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xokalosowerebarapubedaka.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/44efca4286ecbf016dc02091644cea2f/xoginenilijufojikamamok.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e089526a4d2cdd63d4e0c7184b055960/271544531.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/7835346236.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b189919252---tirosumevej.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fca5b8a1f1f505ea910e026081f887e7/38237868192.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a9cfebad5---kirunisujowux.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/weratefu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106da91b30e0---gibir.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/41746123757.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/56100301651.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/95503751992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=libro+h%C3%A1bitos+at%C3%B3micos+-+james+clear+pdfPDF 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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 11360 bytes
SHA-256: 8fff443852763d80ae15657321b94c1bde3a60769a60b0e7fc917848b7058f55
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 17340 bytes
SHA-256: ed70a4c06ced08a8fdf12eb4be15638e775ae0e747dd3b10dc8c487dd6fd8af9
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1