Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b02347abe6651dd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 12:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 426440f05ccb48dabdcbd05e7e28fe8d SHA-1: 95b882f6eac467fe59205edd16c253d67980006d SHA-256: 7b02347abe6651ddd1be07cafcfaad462132d83df43d01dc565c0ced71c19bc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of numerous external links and the PDF_RANDOM_URL_LINK heuristic point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=vault+apps+for+android PDF link annotation
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369a06c9e4b---jakuduwew.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/wogeratupexodapib.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/54890667805.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130e73d0c1f7---bazitekizolalose.pdfIn PDF document text
    • https://vientangluc.com/upload/files/9962925661.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/rajeduvakeme.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630466993nobowirixoravisoweni.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/022203325098.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/8320606675.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/98148797756.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nodotova.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/34616855508.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/12697985602.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/dewopupavepasal.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/zajanunugitagiforoba.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/xofaduxamu.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/98976617585.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/wesikulu.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/75769631535.pdfIn PDF document text
    • https://eguiders.com/uploads/66739298958.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/97344930560.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/7967233340.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibt9l3ni7nsbp6puglaod82pba/simiwonuruxozodubadazege.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/19164110666.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/zelasisomapibididunep.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_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 18056 bytes
SHA-256: 028d9e1ccdc16788755eb7fb1d97f481d47d206a41f84900b31735c84f5f91cc
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 10428 bytes
SHA-256: e4ea4027e2560351336c5a649cdc5819469474902d1e069be24a2874ec9786d9
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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