Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2cbaaaba9e5043…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 05:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f47d6fb6c0c3b1d4461708260c544d58 SHA-1: b25f2d58a090a4b84b575d2d4e4e2cc2de8d16f0 SHA-256: 7b2cbaaaba9e50439da79a57dab70ed0503f408bf13a291e5c90a7cbfec18463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://orthodoxnews.us/file/66725179215.pdf In PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/bojitesud.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kazusewexi.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/tubakekerotefadetexeja.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463c0a2ecdd---31642345425.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/29967526664.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/71008768647.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/koliwofivejuw.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/4967860908.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/67518613954.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/19897383319.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/tudemufil.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/60942122040.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/pukux.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/47375919386.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/fezebep.pdfIn PDF document text
    • https://trexanh.net/upload/files/56639755795.pdfIn PDF document text
    • http://3sdent.com/upload/files/55608318041.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/24059951555.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/pegojed.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/wirebibaxorid.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/fofalugubofegitubig.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613038a9a3fe4---27089020829.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393da6e9f8e---95278193181.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ijfli8hvq3fvn2q26esqoheii6/jefenipupikojunekuxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=benefit+of+ict+to+the+societyPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 15444 bytes
SHA-256: d6abdfd2fabedcfa77e732b0a242a13dd178d661603b5cb0ccc444dc437d7362
font_02_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 10292 bytes
SHA-256: ec33727ecc449c148c2af536f55b0f3da73312d8fdb637173308f0c89c7d991c

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