Malicious PDF — malware analysis report

Static analysis result for SHA-256 529489f9599e085f…

MALICIOUS

PDF

79.4 KB Created: 2021-06-26 15:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b55f1c9af0ba40011f248be7e123c9a SHA-1: 967e7861d27220f1e988daf55c1d70c174defd48 SHA-256: 529489f9599e085f4e00a4c1b17a508e9cf1b3ee766261b6b1e7b6a8da6ab140
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b47d3b0b---60172820873.pdf
    • http://casaalu.com/luutru/files/9289677263.pdf
    • http://dentherapia.hu/files/file/basabawemifarilidomilofez.pdf
    • https://planet-for-events.de/userfiles/file/92838167412.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074439bac904---paxinimox.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b17fed6f969---72465923002.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bj2dijpjaisv8rfoke54lu8u24/kowinupuxijo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f9a0a268---kagibugidupizupe.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0818f13c---munerimeropanomivurafob.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210618_FBE92AC96637742D.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a43b4c91---gagudazanagutenu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95f32ada5.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5kvuiiq6qjecf2nmh4f80sne2u/giladabusilibumovixid.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ea09f9e7---65775901015.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b5e4e5a9---52223791355.pdf
    • http://whkmradio.com/userfiles/file/72389855817.pdf
    • http://tkvolley.pl/upload/files/jafogudodepawu.pdf
    • https://tresonance.org/uploadfiles/fafadana.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/pcuoo2d7t1uqc3229bhu0nidbs/89149291645.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b2624cb9895f0846f843ca1697bc0aad/gilaviwagob.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1dfee6a5d---57843664813.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ojsmbfovm0nomnh8g9o8v3dl97/29887782106.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e82db5e27---bejapa.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/wofojogiduwi.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/bodematibudomebasigotujed.pdf
    • https://poolpoint.be/uploads/file/30208882092.pdf
    • http://onishi-kyosendo.jp/archive/ruzazumirogav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vector+algebra+objective+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 16792 bytes
font_01_sfnt_off0000e806.bin
5da5724646a5795da73683301695f647580beedb84202cd6b9c6a0014cca56eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 11432 bytes
font_02_sfnt_off00010270.bin
c0c0aad3eee1942a64580623c9a545737d18f356b0b03a950ddf4c2b7b193965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 17260 bytes

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