Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef05594ed25d4a…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 06:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0d3c6fd0f247664b6b941846f6b6af8 SHA-1: 3ad970f042c1216e3187e357382173c5cdf1ff3c SHA-256: ddef05594ed25d4a36e383987d452660a2434c9c88630351ddf5ee1701c5e596
176 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URIs, many of which point to compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and numerous links suggest it functions as a link farm to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wendi101.com/userfiles/file/jezutu.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/92058131163.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2310877607034ae4f9d5293b7f2f0228/89432110509.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7ac44e29b0978ef81688d72d90adf5a7/bizupe.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9871fc63d313975574977bab43084e0/vajogopajibexamepafebobi.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/35177071486.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/92867198840.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/e281b4fc4eff03e607aeae0db5149ff0/14817059994.pdf
    • https://smobiil.eu/userfiles/files/12778349609.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/4315c6e4817d4c3a724df9891d04d1ca/pemutiluvetetupelutupaner.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1d69a937123637d12ad64bee312cbc01/konizaw.pdf
    • https://adepotcustom.com/UploadFiles/file/20210522013549163.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5ca2f5dc238173f80a0f1aeb3a669982/sojosukunubedomepunezin.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d69ac4f1---tufovavaxuvusemane.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076ffa1cd98f---filebeloganewokozab.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0a1ee42c286f27cd42017637bd5e7d78/kixaresaguwefalezewavo.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609058c539fd0---53996819369.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/e48c26abd57ef8602c39f8c3de96e5db/rugugekifope.pdf
    • http://raczcsalad.hu/files/11008405538.pdf
    • http://firmen-bekleidung.at/userfiles/file/90786084599.pdf
    • https://candbco.com/ckfinder/userfiles/files/goxuruburex.pdf
    • http://manavpublicschool.org/manav/userfiles/file/majasofavox.pdf
    • http://dallapietamarchisio.it/userfiles/files/wenamigedejof.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/10383582437.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fe282008---37434954959.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=acid+and+base+chemical+properties
    • 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_off0000ec1a.bin
c0982aef0e861bc18d227d072a1f77b05a78e4de8cbf5e7fd0d9b97c2bc1faae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 16456 bytes
font_01_sfnt_off000116ed.bin
6671bd3f660a1ae2d3dbd24d34f6a249f00fcafc0db87703d9cdfa886a62946f
pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 10900 bytes
font_02_sfnt_off00012fbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 16792 bytes