Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b4bc5c172fa924…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 22:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 844effefc96db2211a67f65b8b1b7f99 SHA-1: 731188b7af676554f903130334604ce4fd096900 SHA-256: 61b4bc5c172fa9244ca87e5d79f2f75177fefc1890be01b4fa70b365288acb3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://box8websites.com/ckfinder/userfiles/files/65529856706.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a4a91d60---zuxewisemagexigi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c047b6c4ea8---13449208756.pdf
    • http://bjbtrh.com/files/pic/file/72563241108.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0e4b376c5325ed0fb9224ab5934b877a/kigiwanakodazadapirowugi.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608096771722e---19081025234.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f038a21133---84650127072.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/39925a533381a05f6e15277517f87c55/84302553527.pdf
    • http://agataklimowska.pl/userfiles/file/putevemazobibuje.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098964f920c8---lodupitatexeg.pdf
    • https://aduanaldelvalle.com/userfiles/file/litefepaleduvipojafegorud.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2jkk8avk06o9776m1d7f0tdr5h/nebirumizixewugemoxuvofu.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/tizuwutipilugoxagi.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef88273c1---32293449689.pdf
    • http://4x4autok.hu/userfiles/files/55654157466.pdf
    • http://kfnmsz.com/upfolder/e/files/20210622144233.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bf2f70cd254f1a43d938384eb08906fe/nobekobubozura.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0caff8cf80---37217343127.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/88e6439463626c884ebbaddbcc7ce2b3/titewivoxamugabugetoburep.pdf
    • https://alamansyria.com/userfiles/file/dozujufaziwogigib.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee6870b2e---gefopananizesuvagodisudop.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49c8856aa---23460475950.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67d906704---55707613688.pdf
    • http://myphamlulanjina.com/upload/files/refelefofipewane.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d365e05a79---rojonubelirutedumozipu.pdf
    • http://miracleschoolministries.com/survey/userfiles/files/gamogoxotekox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=finding+the+break+even+point
    • 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_off000107a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 16792 bytes
font_01_sfnt_off00011fb2.bin
3d082fd37ab26a3e84501ceb421d1fce138614d54289628430a7ca351c22006c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 18008 bytes
font_02_sfnt_off00014f85.bin
77796744b6f35a620f7c1e9cf643af35b32fac884b301676ae39b19cbd8b9d42
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F85 10732 bytes