Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806514506c7ce3e…

MALICIOUS

PDF

81.7 KB Created: 2021-08-27 14:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cb1c0a68d8743851d5dc44508966db1 SHA-1: e43908abe67ff7363207eb7a03ba7c9aa4fd66ca SHA-256: 9806514506c7ce3e85fdcffa1b4ec4bd0fcf2f68d2b25a906e5fdf3040659ea1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a2ee22c0816bfa43a3689bd356b6d479/66817719241.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf81ce1c9---68056418449.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/berelajimade.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rmr78qcf2vhkv4rdtplkmj8jh9/sexifopilivukasegelatar.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/midezokovude.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/83739170600.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf4b08c7f---17167972930.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160825f6ddcf46---zigalamexasesew.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/41240013614.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/57972908597.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611eedc6ab5ec---zezurakavesofatukipafe.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/fapejinebozatuxusum.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u8ie957p74iqc2gqj7b5gg19h7/jurinuvu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16105ba98d6b0d---36657790839.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9fd1c73a582d4c769c827176d67af5b1/kepogufesalujigukotosu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e022d182003---23705600498.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/vinuzepona.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/64493609355.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/rumabaxopukafij.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c79fe7eb3ab2c0a0ddedd56208af4b10/bonogadasulogovirakodin.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab9fb53c6e---96785778866.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/56870590833.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/tiwunas.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/gosilekijonubukinuziboda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7959125---18145333980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=subway+surfers+download+windowsPDF 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16840 bytes
SHA-256: 0fb748ebbd4e4dda98b78699b0704d8bfb0064eba6ebead86cd17faaf570b23a
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 10764 bytes
SHA-256: dcf4de0fbd3a184bcd658168964f3312ea7e696f6547848126ac1363d7be4878