Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aa94eb954d2e6c…

MALICIOUS

PDF

90.4 KB Created: 2021-08-22 01:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa4babe48ed3e44d776babb356d05294 SHA-1: 12693442f617e1f40f9142ab79da0c5aa8b5e90b SHA-256: c3aa94eb954d2e6cb568346f83b52ee994aefa96120086217090c7b30621a3ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7896

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=best+ny+pizza+dough+recipe+by+hand PDF link annotation
    • http://sanmorales.es/userfiles/files/votoga.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d434a4e28df---sizaxapetenesami.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/zokedefolavurozi.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224759680933.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757f43b0edf---97048464276.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/394a9e019e22e8798f39ca894b048a0c/25211726171.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d4cfea702---petogujukivezuviwobixeraz.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/86271344348.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091b70e0855d---74030184619.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/xugamudisalodelewa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/112632fdb48dcdff41839c847c186528/48107228168.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jadegij.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7a92d6aaaedc2f3e8469fba5238907be/wugoxesutalopurukafe.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/17567042804.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a414cacd9f1---zitoperulikerefi.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/fevimalezufizegej.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/75979777384.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084aea9e50e7---63875625856.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b091b07b3b6---tivivo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7bp69g0uv1m6igqhfu7chdbv1a/82710046807.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4013bd93ca6e6f104177b846f06f0fc8/kafakajajorev.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/10443751130.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210627_4c084.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11216 bytes
SHA-256: abc8fa89ab85fd6791efb25b46b1164c2b1e26b444213832b673c0aa0af76434
font_02_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 17928 bytes
SHA-256: ee471cb98d0cf45cdeae3e5d9e71c3632266a5db8a9094f5a73fe2137f5d878c
font_03_sfnt_off00014ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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