Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff2027c86450513…

MALICIOUS

PDF

75.3 KB Created: 2021-08-03 22:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d89435f02f2495e29de3db67c79edf08 SHA-1: 7c0a50b790daf001c0f788c636eb9984fe2e30d6 SHA-256: 8ff2027c86450513b16c5ff4896a0c1d743da22ef3f220da4663b195d1ee479b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable or compromised hosting, suggesting an attempt to lure users to malicious sites. The PDF document body is unreadable, but the presence of many external links strongly supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://519pf.com/userfiles/files/xezonareramepeja.pdf In PDF document text
    • http://cbgnfinance.com/userfiles/file/31553115458.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/07002425835963686deb5ecdc93abdd7/ritijasazelajujusewofotuf.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/94691376447.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/73577465741.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a918f427---73989931051.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vofiziki.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0371c6ecf---pebemo.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/91073149951.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/ganip.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/livesorirojobupolojom.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd0df2254---88317093135.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/61788883988.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160975fcb01c8a---wuxudixamobutikekow.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc0eb5a039---tuzarogazilogabovuziza.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e06009055---27424086539.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/17726903485.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/musokani.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wulebixelef.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/gagizimipedixesewuwibeba.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/21e0f916ccce1c79eb7ded35add84ccc/gudizagunoxumevo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb3b1b655---barofunin.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58047ad43---47699590991.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/wijafosirumike.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/70315031171.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fepowovizonabezonax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lidl+auriol+watch+manualPDF 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_off0000c266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 10480 bytes
SHA-256: cb8c09e9e3c4dc24ac635cd09348735c9ab32228299facd1d0529564c6e84014
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 17416 bytes
SHA-256: 02b5e5981a96ecf4bb03a7179c74459ac574a6901ca46071ea2102ca95f5ff6f