Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f73f404a54b82e…

MALICIOUS

PDF

84.3 KB Created: 2021-07-04 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 113827073d7c4b0e769a2ce9910c373c SHA-1: 9018b3a2737ade0bf57112082a8e136490b4548d SHA-256: 15f73f404a54b82e78191f43f15bc0474116915e6a31ba258fb029b72a189e02
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734eb87438---fogudezanejegoleji.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/t4cdma6auek963577oimj4ncc5/61274290549.pdf
    • https://kodcomputers.ro/2664/uploads/buroxizisegovisikulabagan.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/e24lh0n3j8j1318hku05d0p4ju/gunan.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/m51facjb1cifr3slffigsh7quo/60616197503.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dce9440d30e---58328994130.pdf
    • http://ttmplus.com/userfiles/files/46363238778.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31882515b5---katazapotilemef.pdf
    • https://alihuata.com/userfiles/file/60048177228.pdf
    • http://alnadaoil.com/userfiles/file/dafinimezepenupu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2leqa9c4c783foeoc2be690jj5/25705169840.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jl781l3ij39jkrdehh5kvp347t/kevizozuw.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/naxosekezotinosopeluvizo.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d8cf3da0beec96862e1108398edc1f11/kapifevobimeditipinos.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f17c4709---dozobikizulana.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51f0d75e5---lazibuxatuv.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f0a300cbd4b817cffa1ea7683e95c44b/93845812417.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac2157e9f---3396628709.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6ae91b1fa7ce3529cb542ba040249e3a/wesovukesakuxasowake.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/gurij.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c1e37624---povejarudaxiluporet.pdf
    • http://phuvuongcorp.com/luutru/files/12209295810.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/200b4bac0315f861604d361dbc9dfe5b/35146680323.pdf
    • http://cokhisah.com/webroot/img/files/jimudaruvenaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=from+binary+to+octal
    • 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_off0000e50c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
font_01_sfnt_off0000fd1e.bin
1f5c64290c22680ebe1d7b2225d620ba9d6815729418f9acad541111209e276f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 17616 bytes
font_02_sfnt_off00012b82.bin
565df0da1c114227788e3fa6f7968942006ab83e11341156adfcda9c997919d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 10324 bytes

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