Malicious PDF — malware analysis report

Static analysis result for SHA-256 e954b9b81f5d1080…

MALICIOUS

PDF

103.0 KB Created: 2021-08-15 09:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5579d819644951f9ee9479fd2a3e8cce SHA-1: 066c03eba843820f37428edb1046aeec2c59de9a SHA-256: e954b9b81f5d1080949ccfe994cb48efc79e97793cabc770e639dcfdec18187d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://wastran.ru/uplcv?utm_term=la+bella+durmiente+cuento+completo+en+espa%C3%B1ol PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9d14a2f04ee7da6900a604d20751b1f1/gutudodoxajabuwep.pdfIn PDF document text
    • http://packturf.fr/files/jusiwo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a85535a981---43665894368.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305ad3ab55---23306017706.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f87e8b247---kuvoxatokixewuvori.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/49147175975.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/216cdef109f155689d7c3165a64d0e6e/96847006674.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/79804707998.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/50207082550.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/bolumalalawibivab.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/geref.pdfIn PDF document text
    • http://tipiland.net/upload/file/dawajanazebixokogulag.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/zewadedebopiwodujetopumi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/newitokudijojona.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/99405288141.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3b2efa33618f9ba42ab61506825c819e/80296404116.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/77f0c422c1935289979b8d0ff8b4fa93/85546444320.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/s30utjki4v42mlc185niv84thi/66778240750.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u7qqi65kjcc62qe5d17urvdf69/4233039891.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/kemopalefa.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/3290637958.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/dcd5089b10fa144047f60fd46db3326d/bisijutatewifuli.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb87994c8---47209199256.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d316b025a73---15486167644.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/fidow.pdfIn PDF document text
    • 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_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 21444 bytes
SHA-256: 0b0b611fda2304126d3fcac1f44941216187a6d02741bcb1683315443ce95662
font_01_sfnt_off00015996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15996 11076 bytes
SHA-256: 13cf28a61cce5e58a54263678dc178e1faec48e98973ce730ba906ffe92e81fe
font_02_sfnt_off000172df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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