Malicious PDF — malware analysis report

Static analysis result for SHA-256 671a2d30605b46f5…

MALICIOUS

PDF

94.7 KB Created: 2021-09-09 18:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f836371c5bc7fff2de6d046f97f611db SHA-1: 2acb6a63147a4360a40d55bd98608549a0b26737 SHA-256: 671a2d30605b46f5df8b6efec548ec6b2682ae8776c40a3dbfa1d9de79e93b47
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://anitt.in/ckfinder/userfiles/files/97703384960.pdf In PDF document text
    • http://worldprint.su/userfiles/file/gikuwegimaxa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613752a3434b6---19091566111.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/94388945396.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tabezipovojabizexedog.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/75045480587.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/velubuforegejijofatira.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/244e653c1ded4a21df1c1cfe1dc8afc4/41215739109.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/73396122555.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/luwedaza.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613235ac81f8c---votewa.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vulad.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/zabasa.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/788bc9cc7d99ff8a87d3ba57c2fc127e/gadepom.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/kezomulerivaverokodorexex.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/77287471320.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/13310202041.pdfIn PDF document text
    • http://myredm.ru/uploads/file/tobufukaxuxotijamiju.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/giwudugufuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+get+free+followers+on+instagramPDF link annotation
    • 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_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 10988 bytes
SHA-256: 228e71d1a7b69ac7d51eed0ff15b44b8c0598f318566fa72acf3d28a1a2aec70
font_02_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 18016 bytes
SHA-256: d2b619272067f5cc7ea32928490e05591fbb25bf00787c758d97bcd05af87282