Malicious PDF — malware analysis report

Static analysis result for SHA-256 5561eec16163456a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-25 07:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96a781ffb3dfac6ce5c28cefcc4d670a SHA-1: a2080abd3ff323c4edee71d8b798aeee441c442c SHA-256: 5561eec16163456ad9b64aaaf1bb8ce70551765b191dfac43eeced6793615ac3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kingalbertltd.com/uploadedfiles/file/95172370364.pdf In PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/rugezopujutelijur.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/zuxap.pdfIn PDF document text
    • https://luminex.pl/upload/file/75190071479.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be05b29f51---pefoxavonelonojij.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6a3fd9fb5---12751786.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/714b203557a1234cd2b4b4cd5c92184e/96233567633.pdfIn PDF document text
    • https://12shio3.com/contents//files/julamunojid.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbee251978f---97095590387.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4d35804a4bf12e3bb31dea38b4306e06/83737242857.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/sokif.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/kototod.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/epfmd8brka818agn5gjtst80j4/63587213310.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/49536222101.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jazimisomisakijidaz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b2a4de49---fagetun.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/88298116590.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a2c36f6b---pezifejujodopa.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/futitosiwosa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160706c8902e99---67911870884.pdfPDF link annotation
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b693f0de2d4fe3f9e86869c71fa0c79b/davusevatedurodukozekugi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdff9f04e---gifesewapepibux.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bevig.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6ee4d609---94718941412.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/23944455744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+spiritual+significance+of+the+number+1111PDF 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_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 17520 bytes
SHA-256: b6b45271206c21e2b78481017058ecfda0c5dd795c2b4efa121af2d589d1342e
font_01_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 11212 bytes
SHA-256: 74dc7ab815cb2c90c5d948d30a2743dbeb14cb7d9d4597a1c9efa11f59bf23ba
font_02_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1