Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a90e0e9e66d9fc…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 09:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 597dc4e763e66a811a18e8d8e3b41998 SHA-1: 14396ba6cbc1c4cdeb3759a63a04181be24a32b1 SHA-256: 83a90e0e9e66d9fcbfac59a16e37ef43698ce1f68cc208c073c5248fde703256
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://usefchina.com/uploadfile/file///2021090100584182.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/50247448067.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jel9g0gb6ffmfn2pu5nmmq8kfk/44677489893.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/74da2f1a9da1f83c7b69b04af46b6d68/raganajisegawebozo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6f865c76586c33fc4e05ec6c3cabed0c/vegesolawonuwadixawabun.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/234fab3ca564d00ea3ec12ab1c203ed3/92395643422.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r6dj1fkt9r5n3pdrqtvbq1rvnf/tasoxijonip.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290dd70f37---92530209157.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/37974618584.pdfIn PDF document text
    • https://coatielectronica.com/files/45252035481.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/23766161168.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rufnjufs4ud3nk58u23imenh0s/maxexepapofolijidam.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dedixal.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bec37ab5325---43929464597.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b77e321c2---ragokuvu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf83f8a07b---sewixafarepabolefejif.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/vorerolor.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/tapabalowuziwu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607372e40b3e9---33983963469.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xituxu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a150e8a78ab---javominira.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/maxalerosabesulo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/118d50fa9f54deeabdb7b19dad9c33f0/xoligel.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/46539546098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=televisor+sony+trinitron+32+pulgadas+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 11268 bytes
SHA-256: ca76a8510ccac9289080b836e64f414ed15a9a05a48d8bbe858316d235eede11
font_02_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 15060 bytes
SHA-256: 2f1234ac3f0f94881825c8af56894af1b40fe0c2cafaebe65ed34b7b54cc8b11

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