Malicious PDF — malware analysis report

Static analysis result for SHA-256 caec4b34290a4b97…

MALICIOUS

PDF

153.7 KB Created: 2021-07-17 04:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d1df2049b0c10d022d0769e39d0814c SHA-1: d44a08ae1542df5fa4bd6d2a14dbfec695faea6d SHA-256: caec4b34290a4b9781ec47641fe2eb307e8466db11ea13b0aff1e6ecf54826f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ff43e656feaa09e1780112d8d709a18b/nelalisotutijam.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087573174009---mimufivub.pdf
    • http://goodtraefarm.com/ckupload/files/kizovovoxiladokesevi.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b66cfafa---zerer.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5u94n873fc6o5irsivuu23i5t0/35432028578.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/botunefisobagas.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1e7sk82fpcvv63v6dja7sfen91/53934971385.pdf
    • http://euro-ex.net/images/blog//file/suletozumogedanojufulu.pdf
    • http://www.toeterloeh44.de/files/80725370253.pdf
    • http://visusmarble.com/images_upload/files/rurasadurujezisokidixifex.pdf
    • http://sarljarry.fr/userfiles/file/wikitutokuwekosaz.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608980b91bfa6---notodulakaxetogijisi.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/69999517906.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7989d37f9---wipowubifaluzogodabadib.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/639c5a73f4ade66ea13ea6dea40a99a2/33395132484.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojudip.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f246f5f4de---24792151717.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/fd6c56d112cc3c01f6fb232b911ca510/seziwelis.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/8mflmvfrf840ibgoikquj0o097/31731851150.pdf
    • http://voszveszprem.hu/_user/file/zuzetebijova.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1afe90951e4a223bf1036446defc5937/78668981727.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o4ldn355q0jng6mbqh3hm2ju5l/55896123528.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/abe4eda7559d224b5029c0ba3dbaa6fb/zadivozope.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1eh4i3e6lm2s0g5plr62pjn243/80623028979.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=upsc+prelims+question+paper+answer+key
    • 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_off0001f664.bin
e7afc516170c084772ed313a950599a1dab8ea2a7ff91cdd118c25bf13110b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F664 11080 bytes
font_01_sfnt_off00021047.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21047 16792 bytes
font_02_sfnt_off00022859.bin
1ec39dbc05f1ad4a40efe9089cd3bd04d964ab6b6a1465f16e52c834a081765a
pdf-font-stream PDF embedded font (sfnt) at offset 0x22859 18308 bytes