Malicious PDF — malware analysis report

Static analysis result for SHA-256 99af317dc233ed05…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 01:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9d322210a3bdcf72c083a4cb7170397 SHA-1: 8b3aa49675b9acb0ec38cc3245604670bea7c6d3 SHA-256: 99af317dc233ed05a8d3acc304dbec4c66c134c0ab7b08768abcb1a7aa4b5175
184 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and is identified as a phishing lure using a screenshot. It presents a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://laborke.ru/uplcv?utm_term=final+space+season+3+episode+1+watch+online PDF link annotation
    • http://ciba.lv/uploaded/file/31227022110.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148a4da939a3---70605734431.pdfIn PDF document text
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/53128061385.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/4566187570.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nejopi.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/madorigusemolododusukate.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/4148986778.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642b1cee20---xamejepumigudelupaxe.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/visukazame.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fupidewuromobavisezavefow.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/44252705047.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145461dc543a---39868816580.pdfIn PDF document text
    • https://nyig.com/files/file/vigukaluduvirejogew.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/22040615985.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/smsqtsvl6ibrg88163kfigeup0/gopusadilufesijododis.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jukaraz.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/labebovibunabisufebujisip.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210905152830.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/xabidetoxuxiza.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b9b832814e37398f3660ce3e6ad82f0e/60940874600.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb937d6c3---sowabuwiwubevugaravazi.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/jijadumafugijunumadole.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/26832707853.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/dexodab.pdfIn PDF document text
    • 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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 14380 bytes
SHA-256: 6d8012bb1261999efde908640b0d273eacd243bfbfdde89ef5fbd9c0a47d3b1a
font_01_sfnt_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 10800 bytes
SHA-256: 91ed547597db003f22ce0a461a9f5edc2e0fdfa2f43dbd7a9c6fd6dbd0a89873
font_02_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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