Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d6b6cb3c271b72…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 12:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95c70953fe668e0f831839f8446b0f6d SHA-1: 56b359c0c6c14e7dbe8b7fb85cd35dab9fd23ef7 SHA-256: d7d6b6cb3c271b72e35aa758e6803976d9041c6746a2d707882b92438a78d774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=change+home+screen+icons+android PDF link annotation
    • https://nenmongdangquang.com/upload/files/difilatodinisoruboxari.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0afe197b---nazupolipufo.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sokapejolav.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b088db6143---6514427103.pdfIn PDF document text
    • http://carbonelite.ru/file/28382720561.pdfIn PDF document text
    • http://pinxedien.net/upload/files/bimitokulapofuzurizofatun.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/17677980419.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/zonepolabanavidobi.pdfIn PDF document text
    • http://93564497.com/userfiles/46671160791.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/85438637969.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109071725193125.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zafapil.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sefukexaxanajulegademi.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/26105565498.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/xumoxuza.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/57107429513.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/namosuvomize.pdfIn PDF document text
    • http://full814.com/upload/files/38303051424.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090408010673499.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/10405429616.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/bikadewunezabadobakosu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f54723852---94521183625.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/dugafimisabevijewemetig.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/xejovepowubonugo.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/zuxapegorexokigoxizuveza.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/33579308925.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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 19356 bytes
SHA-256: 48feb9c43a7abcf0c2a91db41d02273359868c5581d38054516777dec84ecf49
font_01_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 10704 bytes
SHA-256: c5cc4db859ed3d0183ebcaceb48c7eb5df3f0c49737c6c6405a5b62d16768171

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