Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fcfb8b8f608145…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 09:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f85582b0f91200e0ba0ae0982ede12b SHA-1: cb6590aa7184ef97c73b2620209fbca1f291672c SHA-256: 97fcfb8b8f60814550e1b576d39b6a10e8ac9d8b13f913fcab26d44960bfeef3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with several URLs hosted on what appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://salkim.com/userfiles/file/1480967376.pdf
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/85279080494.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/65522441988.pdf
    • https://audreyheselmans.com/_files/file/lazogefadem.pdf
    • http://93564497.com/userfiles/19020521118.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfce0c47bc---jiwosezutalasipenetezifus.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160f2750884ebe---puwopepijuxisikixeki.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda97a00179---gujojufisofunidopuzigata.pdf
    • https://bleikss.com/userfiles/file/82945831063.pdf
    • http://daming-school.com/userfiles/file/zivejusofamigigem.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hp2mjjstdi0e4qr7lan1feush7/3603418803.pdf
    • https://krassimirtaskov.com/userfiles/files/tanuderi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1507467c76e4dfeb0a914b0dd80d37a3/37332943195.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/qte2o613me4hrsoeqi8g2v0scc/dilijinet.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5tpq70va3ijr3spetj4t6l4sk4/62700153249.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/47504c9739e59a1b568e9e213ffa6b3d/97559270173.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/il78dvkit7qmb02oq3m2r0b8k3/xufefukizunonodavilit.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce09efeb4ad---letuloto.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/94f27dfcb03fd7d6a73ebfa7e9574f1e/25727651476.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/34158741542.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210525064856.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fc46e1859---ketipifofazajanesetuwuzi.pdf
    • http://megat.pl/uploaded/fck_files/file/1530674695.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/jogolonuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=helm+for+kubernetes
    • 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_off0000f1c4.bin
fccbfd430d33606f6cd47fa257ed535b2af6cd9f70e33daf64c00648522197d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 17340 bytes
font_01_sfnt_off00011fa4.bin
38424029cce941635c5d28c43f80326de82257c41a19b399b8a063e25bffeda1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 10444 bytes
font_02_sfnt_off00013756.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 16792 bytes