Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50a6024a5abc6ca…

MALICIOUS

PDF

95.0 KB Created: 2021-07-12 23:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e654d7baa55d9c053c77a0e95666e820 SHA-1: a00a72c4236d7c7345baacea1c856876c6717427 SHA-256: b50a6024a5abc6cacace68451b796c10d9fd3557d2d656c91c445a58258727e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6cc065b6accec8f89852b23533cad0b6/vapunuwik.pdf
    • http://cipetbhopal.com/webimg/files/6952242348.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/87c8cc697fca657011340baa6b9844dc/81264094118.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/mevotikimegojonagiliv.pdf
    • http://autoscuolauniversale.it/userfiles/files/78122911453.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07bb793c2---64475595872.pdf
    • https://beyondpins.com/calisma2/files/uploads/40748396882.pdf
    • http://chiengthai.com/file_media/file_image/file/9623435085.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e14bde977---liredejodexifuvufivoda.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ac815a52e5b0a1167a5cabf0d8f5d6ae/pelozikejupewadarumon.pdf
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/bagirasejelexatakufizok.pdf
    • https://evrenmentese.com/upload/ckfinder/files/33408919096.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9616925bb---90430883426.pdf
    • http://glcore.net/ckfinder/userfiles/files/41295658602.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/287f6fbc585962ea1baab060d470b461/50396050077.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c41b09b0bca0e5e8f5afc9c465607b69/xitorulawapakujor.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56c478efe---58640144749.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/76297939285.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/galawikeguvafuzegimuve.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8fbea75d---6485489824.pdf
    • http://enotecagaribaldi.it/userfiles/files/89480999527.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3c8c399a7fc847294348da82bb2ff941/62846488737.pdf
    • https://presstone.hu/userfiles/file/masune.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0vrfbjbvkbunkeroi7c0j3e10j/vuzulilaxoxijubidubalojel.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/3996377521.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/51d9b926c0a61bacad2c2967e6aca879/55444258153.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=checkpoint+firewall+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 16792 bytes
font_01_sfnt_off00012632.bin
382d77d867cd1280960cce7482dccb42baa525aee383a89610dc9bd5d6250103
pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 11240 bytes
font_02_sfnt_off0001405d.bin
f7df412f8b3a136f9bc0401aef6a5f4b860a1a7650aeec783f6c4d08c8b35efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1405D 17572 bytes