Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e1a1e3c92c7c17…

MALICIOUS

PDF

80.3 KB Created: 2021-08-11 05:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75c01ac2486a32335a8259f3c723369f SHA-1: 8061c8baf9c86e5f6ac379f177341d6a17a82e96 SHA-256: b6e1a1e3c92c7c170d3d59eeb97d18c7d251cd4489dbc66e8a823747ab37487f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristics and numerous URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=pythagorean+word+problems+worksheet+pdf PDF link annotation
    • http://ingmontagna.com/userfiles/files/rafadekuzozuniv.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/samohcivt5dtrqk22f13ai28vh/nizonax.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815e8ae0d6b---99152410075.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/robegusopomawefasubat.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061602463373499.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8aacee5f---sezurogaxubupetifadenuv.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/34353178463.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/26226279003.pdfIn PDF document text
    • http://demkapi.com/resimler/files/82425565260.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/dosilukopepopi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1de7963cc58014e0210448fe9abcf3e8/tujatefefenorobudik.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f008e86539---82150075685.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f35c0b726---29948845165.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/zowobu.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/89164688115.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806aff09dd3---lijitirurew.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e72a6fa9---72950737698.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b60854864---didudidapata.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/98784481857.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gowelesoxefikajo.pdfIn PDF document text
    • https://tmtteks.com/files/95612153364.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fdc62f706af0adc90742819b805978e2/nosufefemujijovekewojimu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/12009046871.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16388 bytes
SHA-256: 6293324faedd3b53aee8727b197e09aa9bac744f2f94472ec8d0f2ca18cb1970
font_02_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 11284 bytes
SHA-256: ecf63dfc42fc9feb85b13caa893c623a4e96a7a891573d293730114ac5088649

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