Malicious PDF — malware analysis report

Static analysis result for SHA-256 2013779415d50018…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 09:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1907e8b1e37a361e779665fa21be2698 SHA-1: c2941607218ef9e38eb506acdecd45fe28c698a6 SHA-256: 2013779415d50018bf2a2667f01f918c61b64a9e31fe13d1c4f975c661e09be2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=facetime+on+android+tv PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f0b81ea---20236366108.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/67940891564.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/totasebariguzujib.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wunokosepewej.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/xutezadevefitur.pdfIn PDF document text
    • http://pvvc.cz/files/87367908213.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/kuxudogodejeborotuwabopu.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/22572681089.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35173381285.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/28907048578.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/56568139675.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/gimebo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/wogojatonaduzavuxeg.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/degogifofapikelefefovu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t41ag9c7n8qmhlmr776u6jf6h0/boganigobinogovekasagesi.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/18081203534.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/68376666708.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/namebafiberapaf.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/47407428930.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/dujalabevexabojupux.pdfIn PDF document text
    • http://llux.vn/uploads/files/43926162693.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fivuzurototizas.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/14811979459.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/daxegemuk.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821f811563---gekifibekanadixe.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/vulumiw.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_off0000c2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FA 17464 bytes
SHA-256: bb3f5af358c407bef5ed31524553eb8937cfccd9d56c89706abd6f84d65a5dbe
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10360 bytes
SHA-256: a8fa357ea08ca7c2f42a680838f9d248b48de6335bb86454885e908823fe5bba
font_02_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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