Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9a7d9cbc1fd079…

MALICIOUS

PDF

79.0 KB Created: 2021-08-09 10:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dda1181951892312fff123d9503bd5ef SHA-1: 59366b74d0d2611f1661a21cfd9fbd239bd9d36f SHA-256: aa9a7d9cbc1fd079c3838be94f9706beb5d020f693dca0a5a749e898ca2596d6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to host or redirect to malicious files, as indicated by the ClamAV detection and ML classifier flagging. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7544

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.
  • 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 https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160884a040af5c---2619489396.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f22b6f110---ginet.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/5977654914.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/675f82447d297af67eebed337449b4b9/bilopumetunewidol.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/59058827800.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/xunagikezogefisezuf.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/7198548805.pdfIn PDF document text
    • http://househouse.it/userfiles/files/69765102303.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/70dc0166e042342e72dd627d3a86db55/67988539388.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/02cae3c7a145ac3ef2b8d344d1e56187/69179399593.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/ribalowuwoxosev.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/12291098299.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/115057fe113a3cb8d72e790253b2d79d/nuwaro.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14e14cbd0---loponuwoz.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/gonepipododopamazeber.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4b18d9cd---wetawifelit.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jqdgdo6icokejp55if74aso5na/pefujezololufofi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/90739437366.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/46107913049.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/36qpcvletig76ejhont2ljva44/39562789306.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/3839632597.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7b8ad7fb88c96deaaf30f635f57e039a/6834411172.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xurixoximivekuterev.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a37b6e1e---venobot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+lk+bennett+sizing+likePDF 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_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 10452 bytes
SHA-256: daea48ec2f99477537c5bb029d16a5b505f95800e847fffa3caccc90622c334b