Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c7a202d0c3f526…

MALICIOUS

PDF

76.9 KB Created: 2021-08-27 22:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 260d447ff7e1b4d85ab5dbe2c9d1b846 SHA-1: 9cb35b8e314beead12897069d744178cfe7b930b SHA-256: 35c7a202d0c3f526d33e76a58996f400ef5ed0684c57eb117ece63aa8f168020
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 with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://koddous.com/userfiles/file/witejusexima.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/pazalelaxalupitu.pdf
    • https://giverny-bkk.com/upload/files/bexibusuneko.pdf
    • https://pharmnet.cz/ckfiles/files/files/kasopuraj.pdf
    • http://ankurgroups.com/userfiles/file/poxubad.pdf
    • http://blessingsngo.in/userfiles/files/1538574386.pdf
    • https://abouelhoulgroup.com/userfiles/files/52279517266.pdf
    • http://amadpich.com/userfiles/file/42472770609.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/korijadogozama.pdf
    • http://lauraestetica.com/userfiles/files/33669439278.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a21fab64eb7---80968289336.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4508ad6ce---70715570490.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/130a0b836a1096648a8aa5cadacca4ec/44217844722.pdf
    • http://anchor-m.com/js/upload/files/gofumazitarezutatesuma.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa005099dc---14086373088.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b6c4113d---dibun.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051320322673499.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021618151745574.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/230fbc2599d3ba716cbd4f48a6497e55/94443378455.pdf
    • http://be-now.pl/userfiles/file/15459697121.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ff62a96---wopapoj.pdf
    • https://sieuviet.net/webroot/img/files/64110711137.pdf
    • https://igescanada.com/ckfinder/userfiles/files/pibagixur.pdf
    • http://twtime.com/uploads/files/202108251045427725.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ps2+iso+free+download
    • 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_off0000c857.bin
bdae02dec3be3a88626c2a06d5c57c18891c099519899aac641625b5420f1a31
pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 17472 bytes
font_01_sfnt_off0000f531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 16792 bytes
font_02_sfnt_off00010d48.bin
5e1f630c506543cb315278b8c0a1463d7256b08728fad0feaa09648ba269d87b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 10456 bytes