Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ae678d8347f24b…

MALICIOUS

PDF

66.5 KB Created: 2021-09-01 19:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: faf3f07bf38552d5d65aa20f5eb19244 SHA-1: b9ca7bb989ba53458d8b6ea76f7176d5d1610052 SHA-256: c1ae678d8347f24b654927e4b34bddc8094256f3ce2e1a45098a2ae9effb741c
202 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6322

Heuristics 7

  • 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
  • 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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090df3d0586e---mawadupogifakofopiv.pdf In PDF document text
    • http://kinel-hunter.ru/upfiles/file/19908243699.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tapotumu.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/nujovexalep.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/14208401265.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/72f03f7528c2f08b6d477bd9caf24361/zoduxikajutafugevewex.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d21683768054a8702651fef63498bd28/gokivava.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160878e220cca1---99571907938.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607288c41f0e9---86122800550.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pu4nlerpmedkqb05ii0jdj9ep0/sajelux.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/texuzimivaz.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909633c079d---rukobupi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/85463736288.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/89616524521.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff46fe9458---36509019178.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/9534469307.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/91754613642.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/34582274419.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/82314948796.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/cd50bb0b6467db09e1c7e3aed00955f9/69466227530.pdfIn PDF document text
    • http://adveotec.com/img/file/15439974678.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/kivojolobatibup.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cm5agaomu1fj68i167ks3pl317/71156408587.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/jiramupezigizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=an+orchiopexy+would+be+done+forPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 15964 bytes
SHA-256: fe9291980eb5940791f45af5d4c2a1b779c62d72a9e5d22af1709b3fb891523a
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1