Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1f8aebb97231c4…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 09:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e00cbb7731bce61c1042bd71990c8178 SHA-1: 780afd322ddf9f1e60a2f6d2d25c01870660fcf5 SHA-256: dd1f8aebb97231c499b67b7871112b6c3d6f025db149e20265fce6d35c937cec
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading a secondary payload by disguising the document as relevant content. The embedded JavaScript is a common technique for initiating exploits or downloading further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5261

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nomylo.ru/uplcv?utm_term=upsc+cse+mains+syllabus+2018+pdf PDF link annotation
    • https://pbchistoryonline.org/uploads/file/43003251304.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb308809f---16262619561.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745f677c8ec---modazefibadatunu.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/pixigilix.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/slja6h7k0pte753h4va2es8pkd/dexoxo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16125a2b03960e---razibapizan.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/27765359246.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/67902030863.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abae8d7fc00---luwederazarubalixom.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2064bce9---69188775440.pdfIn PDF document text
    • http://cutskytools.com/d/files/68236484897.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vodulikiruvoxakonex.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sod4o58kgh1ct4tk7ji0akelf6/65130267785.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/tutos.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xugigarinegozigigi.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/86513858908.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a43764d1640fcb24c1392e8f9f313092/97755753786.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5f154beb---44361678752.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/wajonuberuna.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/dijipadojevulek.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202181018424858.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e105f3650---savus.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6966bd958---46453967386.pdfIn 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_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 17536 bytes
SHA-256: a1f2b7bc379728624c71ffecac2bf3a6d24bca7faf60ee3812083c64e9b73c43
font_01_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14019 11324 bytes
SHA-256: 03d179565f6c425693c6eeda30f806a5729005f525666048e023bf02e5401762

Open this report in the interactive analyzer, or submit your own file for analysis.