Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c8484798bf67ea…

MALICIOUS

PDF

94.0 KB Created: 2021-07-19 09:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3118fa6dabd3cb66516f78b73fa911a2 SHA-1: b452d0ae795abb42e15f0404e2092750e81b2937 SHA-256: 82c8484798bf67ea8a019d1127cdfb9fa8fec0326984b902b7ecd1156f5d557e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs suggest a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3c3e7842---gabojeposeruzosogakeg.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/108d61b9fbba4501f3f3a27fe6f3e2a0/66386082409.pdf
    • https://dusunceokulu.net/resimler/files/24292967357.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/52b0na2lr1992m6vq99m1v4b93/kuruvid.pdf
    • https://carlojans.com/cms/file/40270219197.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0db113d0c3fc97c1c2b29f097def94e5/mezukukagikatum.pdf
    • http://righetti-ticozzi.it/userfiles/files/jukibesaliziwefurelowide.pdf
    • http://nessium.fr/userfiles/file/jekanurux.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160767c87a91cd---radigekofuxirujaweriwuvip.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/raromulawej.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/basij.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/499b5eb071b0a92ee64341171a330859/70941767100.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xalubowerudepijilaj.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb07cfb2d8f604140c0ddc80e144989d/titiwimajawafekexuzod.pdf
    • https://ldoris.com/upfile/files/20210704060103.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1521856c71f3068b85f77a319c451a29/gagijagini.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6c536fd2---93602700811.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12650072e5---rebulosuzupopop.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/832036168dc58b6f6269d20c0c9ce998/jikag.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a52db1c4f---subofililiwifinabab.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca4cb7244---44051761631.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075482815c55---48355260904.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/45600335e1d19c666781a1b1ef97809e/pewekarefojiluf.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/niweputigefelifidizud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=analytical+interview+questions+and+answers+for+freshers
    • 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_off000109e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 16792 bytes
font_01_sfnt_off000121f4.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 17636 bytes
font_02_sfnt_off0001506a.bin
8a6157cd3db2d96a46115652ed47f4a9a44c1cc757fd9b2dfc283f5a1019806b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1506A 11064 bytes