Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9192c03b12094b5…

MALICIOUS

PDF

102.4 KB Created: 2021-10-06 15:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7965fce07f5c82dc72e31daae0178574 SHA-1: f193f5c091f41a4804e99587647cfaf8118be4e4 SHA-256: b9192c03b12094b57f2b75e6eb6e4fa40116795a4ef4afcb983b847c36b658df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://szjwwj.com/userfiles/file///44972050705.pdf In PDF document text
    • http://georgekoldun.com/var/upload/file/fuwuzari.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xagubobikelevoled.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50835570972.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a96c889aa05abc5ea8815f8fa79055f2/93339596959.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/80496370266.pdfIn PDF document text
    • http://sergeybazarov.ru/file/fikuxowurokafefaguzadime.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109092327524953.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2fb7ec86d97fedce1f68faec8c89b97f/68104271676.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/4756842901.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/bipiguwa.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/lumifibapazu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xojoxikotad.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/wanepifojitabovomegojegok.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/27490709725.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/9087203920.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91311535808.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde6586167---vulagetixij.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3501dd3fa---nukusefesutubowavaviwewi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7320182077bd8ad1ee8a063b447036c0/gomowupewi.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/68514858617.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e908596d89---dekodagenerolom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=beatles+let+it+be+piano+sheet+music+pdfPDF 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_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 11076 bytes
SHA-256: 5ffdcdfb6ea360c3e76a8a073dc350b41fe24b79084b6528169fb1b34a16bc24
font_02_sfnt_off000158a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A7 20272 bytes
SHA-256: dd0e2738d9c263129df92110062dc76aa9dea275df0c2ca573fe5f6c6196110e

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