Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50b560abd3d7025…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 16:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 275716560c6e8ba29c5a869d88aabaf1 SHA-1: 326e78028213479144b5445f024b58d1228b8f17 SHA-256: d50b560abd3d702569d5faa603214bf88cfeb93ccbb9151cc58bdd74415b2b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=setting+up+work+email+on+android PDF link annotation
    • http://0975811252cool.linker.tw/files/vagerilobekujudidupunuju.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/jafefikitozitelawagareze.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/95435525829.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/muzegolonefameluzirijovix.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/91602591135.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/13741897736.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/mowirutonopanazalinotor.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/lezakapi.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/62317599234.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210910100655_829811078.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/vigevavogar.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31a9b22be---28781682653.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/jibifi.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/46962239389.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8a566c4057f92c2b4a69aa9f0af48e6c/7934431515.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/69368040085.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/sumivesivorifa.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/lubavasotizeju.pdfIn PDF document text
    • http://hrudolf.com/userfiles/60492664221.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/mofefimibonawijovisumeke.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e59d057a75b799dedf9efde5764aa865/risugugimobi.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/63337200303.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/siwekoxo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/svqvvisb56obknkqmmbckjb1g7/53046328398.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cfe69ad3---vakagalakigigupo.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/32616182263.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_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 17732 bytes
SHA-256: 83be2b66ca1cc7586639ebd5b8cfa200f8a209581fdcbcaa724167377b775549
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10920 bytes
SHA-256: 8397bdc0ac7efbc8ee6f9f62a458c609dd4fafe7c2b617cb8b4acaa509e976a1
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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