Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bc2f785a779f72…

MALICIOUS

PDF

75.9 KB Created: 2021-07-04 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 568ea53500fd682dbdda4a499ea075a0 SHA-1: 64909b6ce519b888db25b43ae257a80a68375fc6 SHA-256: 62bc2f785a779f72bc44e9264734edd743d83c85dedebe71b1e5011a03c8db12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8016d3b78---bowonuvigolijifevuzejobig.pdf
    • http://rauvuonsach.com/images/uploads/files/gevowaf.pdf
    • https://turbooto.vn/upload/files/tuvomenifapo.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd607c1e2d---xixafegubazironobabesiwax.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5kv3hg24she790qpfep6lnos3l/naxogakeru.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af756f5f4ff---38575571772.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/546972d8e6936bd89032ba150f45e140/falusokoputemufi.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607786bd870a9---vikedesepofem.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/qksq63njalitabeudqpag5loss/logopariduviwelolikog.pdf
    • http://duszek-lasu.pl/userfiles/file/dadiwaxulixub.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/638293506a97b74baec3efe917593b7a/jijarilemamap.pdf
    • https://aradovan.com/userfiles/file/51353422860.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5af29b399---46619228818.pdf
    • https://regiefranchet.fr/userfiles/files/jokebaganiz.pdf
    • http://ankaser.com/userfiles/file/gotixusibilikewapotejo.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1312b6cab0e28a0cae67e9f103177a5b/lefexigedopigotilenavun.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/64112352148.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086b06930f21---wexifubereze.pdf
    • https://lexcyberia.com/userfiles/files/jasutamedixepirubobiweb.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a495804a9b0ac0080b89f02c25fa877d/71315387145.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zexomi.pdf
    • http://quaint-house.com/kupumebuwakisonetajobodan.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd9896f7a---memedimomotimafu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rjhje482s6u6pv4mia8jhptbng/vanawar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=calculus+with+applications+lial+greenwell+ritchey+pdf
    • 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_off0000c4bb.bin
42df694e7963c6d4d917cf550a04fb618762df13af00798d9bb6ca4b5b3c7b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 16532 bytes
font_01_sfnt_off0000ef9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
font_02_sfnt_off000107b1.bin
ae4e68e5a474bd6aa1b8d4ee96b86d2089070fd9b0a687c5c88d313721852c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 11228 bytes