Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9db87f22498f8e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 01:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4964e454aa34301b0d424e390dea0e50 SHA-1: a1074655a4ced27a3e2d31221e94c1307b25cf96 SHA-256: 2b9db87f22498f8e58d5eba218019b4fd9ad9c1a65c26c5b446dfaa22826a096
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute further malware or phishing content, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613f440350339---19968281643.pdf In PDF document text
    • http://dentali.cz/files/files/87016844398.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8906483d9---tebotexipawepomofuxata.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/34222208480.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/disolizogejas.pdfIn PDF document text
    • https://network-italia.it/file/japezanodosujivuxunuj.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/83736224310.pdfIn PDF document text
    • http://cabini.it/userfiles/files/50943205367.pdfIn PDF document text
    • https://12shio1.com/contents/files/49283502498.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/65411491665.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/48456332837.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_235403.pdfPDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b48724772---96416480522.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/92447206988.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/28226357796.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4derbiagh0q3oscp0j6erck372/losobeko.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/wirivutolifupojemukoz.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/guvunazutobani.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tatasakegeweduxizuwu.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/bavanulikuzaragor.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mivedo.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/2707918848.pdfIn PDF document text
    • https://mavibusiness.it/file/vowozosubowexilujif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=indian+movie+2020+onlinePDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 10304 bytes
SHA-256: c3aeb89b1aca72b4b8b218a47f552e7630c2df55b78764445e0b661c5feed1de
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 17224 bytes
SHA-256: fddd8a2fde356a34c97b145fe1d4426f37815437bf3625625cd06c5fd879bf08
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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