Malicious PDF — malware analysis report

Static analysis result for SHA-256 71710b78b571c40f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 12:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07d60acf474fbf0ed425437b4e12027f SHA-1: c7e65eb727b9dd041bc952277e9e51185fbbdc49 SHA-256: 71710b78b571c40fef3a2c9dcb924634010a25fa74ba4ee66aa575d735c65d0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of 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 https://inwebjor.ru/uplcv?utm_term=self+driving+automobiles PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c266a9536ce---fixuxadavutobobejuvixan.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/po1ct6rsp3n9vinitm97j82go0/87654399206.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bc24b3a9302---86161548114.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/28555153886.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/69986993e02a3479983b10f2455704d4/sidubakelimukonaj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c88007ac700---wizixepine.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5ba17bb6---zozokizazusutegus.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073dea7a9d61---boboneniwibabuwosuwof.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7525118c94785c76e777e8ce15e625c8/66829948262.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/5270079755d2d60f6b46c849f1f0cd79/runijafareneroder.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/gatasoviwixakana.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/32785878565.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/75711683843.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/somexem.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iehlimc35ijbbssarosjsejt2/30727076775.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/27778381144.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jerurokubozevup.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gigexenewifuvowu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4793c25687---zasizidimibob.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094685bf0085---zenaviledotakuluxun.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c25db1f0bec365df5ab74fd7f5d00a9c/95956875527.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544c084f67---wegixonuxetewu.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/redekenudowejuzud.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b93f27adf3da3edfee32958bd71cf77d/pavumovilopuxatibav.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a3f225c---65319146639.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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16888 bytes
SHA-256: 96d687a6c8a30389e6e716e641ed7bab63553c9c944a73ce29187e13f169f96f
font_01_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 11076 bytes
SHA-256: 0ed533c5810eeec50e7d1806a7f458a1144d009679a039e0a6d6430c8b1c8ef3
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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