Malicious PDF — malware analysis report

Static analysis result for SHA-256 58acf90abbc7ce65…

MALICIOUS

PDF

94.6 KB Created: 2021-07-04 06:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 555991b558e12d2999218f1aa0f3c30b SHA-1: 26bb5d2dea8c978197af7a3a5b6c354732f4bb8b SHA-256: 58acf90abbc7ce659eb0baee145eee5f6a8c4c7e8feb8c3362bab5c5ef037c9d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://kripasec.com/userfiles/file/piwaxudewute.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f58d9104---92096425921.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738af715dc4---79885999448.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/69359393694.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b498b9f9---sinakuj.pdf
    • https://bouveau-consulting.com/userfiles/file/bujitatewufavowitivumovuw.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5dfc70a7---7919698181.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9d2b9c68aaa18c97707c3c4acfa7efc2/rubirodujufelawojawiwetar.pdf
    • http://wamer.org/userfiles/file/63990246290.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d3257f89ab91af0f2e385fe87bed21d3/17135722052.pdf
    • https://nhadatonline24h.com/Images_upload/files/bukova.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608648df91389---tetunutafivizelenibip.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b2802c07607ce1d728fb80f8bca04655/52415063549.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/21922325527.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/sdhe2p4nb8vi66pjkv41oogith/lijozumamivaw.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eae1a388a---lopuxogezususipomebalu.pdf
    • http://macautemple.com/userfiles/file/bituritosupodun.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/vogovuvujijanimu.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/068d8b13c72e98a5e396047e29a107d7/52763015411.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/28999482927.pdf
    • https://monyetjoget.com/contents//files/guguzuzanozutewibaxilasow.pdf
    • http://fygl.net/uploads/file/210858098444.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a16dd7d8---fijazerefuwabelineret.pdf
    • http://okfilm.kr/userData/board/file/71110053969.pdf
    • http://sun-eko.eu/files/file/zobarivajodogagon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=quiz+on+water+pollution+with+answers
    • https://medlineplus.gov/waterpollution.html
    • 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_off00010e42.bin
fcf64b9b81c3ab23168b2e5ba80198a1ae3b98c868cda57e5fd5a96d3b724188
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 10652 bytes
font_01_sfnt_off000126c2.bin
82212fb3f7de195e35eb10265fe2c76a3b3c49648b2dbf4bc671f4ffa71db651
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 17688 bytes
font_02_sfnt_off000154cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154CB 16792 bytes