Malicious PDF — malware analysis report

Static analysis result for SHA-256 708b5e3c1a2e197d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 03:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b92a91bd1db1b29e195d84e74cfb795 SHA-1: 0bcf395e19bb78c871ae5eea1f1eac31826d71dc SHA-256: 708b5e3c1a2e197d068c12a5537481675b1309cb0e0b3942ca5a8ad18dfadbc3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lindendirect.com/ckfinder/userfiles/files/54542064920.pdf In PDF document text
    • http://learningkey.org/userfiles/70760004438.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/81210321111.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/fitevagasibu.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/74184842588.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/34258369608.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/474ece07e81f1d5d71fc76f0502cac3a/46122518179.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/suwufusagopokafanesefu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/25ojjbuld02nlib74a40rteo0b/69595921212.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/gujupukuvima.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4fdb45df5---madexunuzabu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130662e3ba48---jumokologuwilobasosa.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wafuresukuziwerole.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/77458399088.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/62573438016.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/10432462831.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/80862183961.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614685da4f095---sifisiwawowonovifubitiful.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/xoferosafe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/23068383035.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/40379903413.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tamodarumerikovu.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/21046113734.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/nufaxusufarowewuge.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/furotigogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+iso+windows+10+home+64+bitPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 11060 bytes
SHA-256: df9f62a5f2ddd136e1d60a0209e4c1f0f1c7d05a0ac2dc8e083ce56779dfa7db
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 17680 bytes
SHA-256: e6594e16b117fb619f499906a580c693cc7b4d521599862c90d6f973126a9cb4

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