Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecaebed4266b453…

MALICIOUS

PDF

94.9 KB Created: 2021-07-15 15:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f38ff51043be199a81edf774f803320b SHA-1: 235eb6a243e7d28ffe14dd70bcc62d04183c81aa SHA-256: fecaebed4266b453036483a46389ee8e6cbfb53c3f996cd3db2288058962fcfe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to these potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1f3a66df1ef5e346e00e10a1fc5374e5/56596936844.pdf In PDF document text
    • https://cvsc.co/userfiles/file/30035409783.pdfIn PDF document text
    • http://ccshecea.org/upload/files/safap.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zokubiveruzibasanafi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/58289295567.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26163e1a7---69010204486.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4e720d08---mowovopor.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1a574468008c6004726a34e370d7c18b/30356186409.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607384ae8e165---lexiloxewibiditapalume.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4cfe930a88ede6b81bfa673f033ee59d/radelilipomanedisobanot.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/rusames.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/516494f07ec7b43b2274f1c7f9b422d1/40805712179.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/622fa1662257369a46457dd2af913abc/pimumugiw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9922d35f8---87704124873.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c076832a51f---33589879416.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080f70b81f57---kogexonanerapijaj.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afecc80f363---tekobekepanoz.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c598de49036---zikofurotewabewe.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7qn899k1e5v45t1cfaqje5m5sc/binirugudew.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/26idev8tibri6vs4t5d624gfk3/sepuleposunetabe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9acf20e48---26521128535.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe7839f29---manodabitutojoperanof.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506055815474031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+celsius+into+fahrenheit+in+infrared+thermometerPDF 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_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 18076 bytes
SHA-256: bef7a93464bb4b09d9b6f2c8bd6922d8d827bbb0a47cd44e6d2dba180bb55333
font_02_sfnt_off0001541d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541D 11100 bytes
SHA-256: 3d49c7bbcea75d9d26436195542210f87414160e0c78f5c015c88d9fed1c7b7f

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