Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e74980d1c377f3…

MALICIOUS

PDF

79.2 KB Created: 2021-10-13 08:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a0bf0be6b7d96ca2407f74cb60bff63 SHA-1: 1efda04e0a52f4023dc4a779731ae588fda4c71e SHA-256: 84e74980d1c377f39fe43c6f51a72a57b43e514c47747dd666ef0387a57487fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm heuristics confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tongrentangthai.com/UserFiles/file/gogikopironazof.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6b3fb5a95d960b78fc737f58162e332a/popifad.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155ca760298b---fikorotuvisaziwilitot.pdf
    • http://galenbio.com/images/upload/file/nesurobutitara.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/80f3ff3dd17a94afdcb7f59739bcfe19/kifibodenuruxase.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1b894111---21582892831.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/vewexir.pdf
    • https://renesens21.com/ressources/upload/files/41440192096.pdf
    • https://loonbedrijfschimmel.nl/userfiles/files/71618842094.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/4580131870.pdf
    • https://tedesco.pl/userfiles/file/gosinapoga.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/59077304266.pdf
    • https://vicotelecom.vn/static/source/images/file/65544830959.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/57097434725.pdf
    • https://taumed.kz/upload/2021/09files/210928022752114853m59eo.pdf
    • http://vedepcuaem.com/luutru/files/paboxomugodotol.pdf
    • https://mobisteelegypt.net/userfiles/file/doserur.pdf
    • https://ecohort.com/userfiles/files/37441134096.pdf
    • http://qlionshousing.ca/userfiles/file/lomilek.pdf
    • http://e-baze.lv/images/site/file/xerafimujagutimudezozege.pdf
    • http://teleinwestor.com/userfiles/file/pufupujew.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab94b4f47---subofukudela.pdf
    • http://rosesrealtyhomes.com/userfiles/files/sowidosumulofeporolajugiv.pdf
    • http://rialta.ie/userfiles/files/91159443368.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=the+following+true+stresses+produce+the+corresponding+true+plastic+strains+for+a+brass+alloy
    • 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_off0000cead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 16792 bytes
font_01_sfnt_off0000e6bf.bin
160c67619de52e3b999e83e6d50c8612dbeab2f5a225eb9a49c681182adc67cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 17468 bytes
font_02_sfnt_off000113e6.bin
94fee639e100a1cd95c31b24a8629282d69f938bcc97e3bd080ae58b7d37501f
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11304 bytes