Malicious PDF — malware analysis report

Static analysis result for SHA-256 168987f6fcb16a84…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 11:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0b0ea9997ae9f353c6044775e37476c SHA-1: d30e690b5233fe039ba8ee6510e9f000f1940a6c SHA-256: 168987f6fcb16a844d8417cbc42d9c34839584d500f9bff2ad29a72a77869374
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614131f1b7cf1---84690477621.pdf In PDF document text
    • http://alhouti.com/userfiles/file/fevomibutulakobit.pdfIn PDF document text
    • http://slsnn.ru/content/file/pitofubisul.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/30583956214.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/timapawigapaxariranomedu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7bf47e4b36db19a64d55ecd276bffed7/vinoxaxip.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/wubelugafaropuf.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/49136652591.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/4760539603.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/puxesumiridexobon.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/vosesakidatapu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132936056640---makupunol.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/69549030036.pdfIn PDF document text
    • https://baongochoa.com/upload/file/beronoxarojokevesovasov.pdfIn PDF document text
    • https://manenshop.com/upload/files/89531101209.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nezofofejoruk.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/fijuferigasokajonogarabo.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/23609895901.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/laletare.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pisufedugufeb.pdfIn PDF document text
    • http://stylekd.ru/files/kotaduwofizido.pdfIn PDF document text
    • http://sbairs.com/datas/files/naxijokotan.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/budefabeludadepumekaxuwu.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/81838679629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=letters+with+iPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/paxobolegudewujelopoba.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 9816 bytes
SHA-256: 01e0708563f888146103f25b19d8ad240aa95365f15330baf04f4c2e758ab8f2
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 17100 bytes
SHA-256: f78bba8fc438c574ef3555328f4b2b5cea43e3c87472906307d64bf7436b5d22
font_02_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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