Malicious PDF — malware analysis report

Static analysis result for SHA-256 6665b7a12b1ef746…

MALICIOUS

PDF

93.6 KB Created: 2021-07-06 22:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ac532cbf9fcbe8a1c327ad4bb2501126 SHA-1: 67d302691bb7dc07f4adc1e72b95d7be59019318 SHA-256: 6665b7a12b1ef746cc9d11a473d3e8d2ea479f1111343f7059b155f8caade99e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://queure.ru/uplcv?utm_term=valuation+of+shares+mcq+with+answers PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5nhpi6fqiebrmk6v8ch7qdeqc5/44577616954.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd4303ed9---fadoxelanefinigewo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/da38161829ff85f03eab1072308fd00a/bulakasof.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/papumiwejuvoloxupolixifaz.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/20962756299.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/28562194344.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/danugomitupufodipafudezu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607716fd827b2---72659126968.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a9htuoh1akrqd6sukaku6pufm/pisoxuzogu.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/fudubafaxujivigitabemize.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/21161148955.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/xesojapapagaredipano.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/hle5vfphmd5eff2j791p8qkhp0/filalivunisetokakutode.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nifepijonoxenezo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/bd248cd3ee856967ced6690fea49b332/xariwokejidema.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/8f809da572229b226ae8f68136fa2b36/78731005048.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607863903ec51---19650354994.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce34c29b7---69646851673.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/71330565263.pdfIn PDF document text
    • http://ligneus.hu/upload/file/42275066504.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f468350c---juzeperogowasasevosela.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31e0ebc7f---guserosomila.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/71259013957.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8fc90be3---66456675826.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/85338075951.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_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10900 bytes
SHA-256: 4425628b6edcce86f475610ca6dfdc43c461dfe78a4452c5e974b57502f8eba8
font_01_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 18720 bytes
SHA-256: 7e812746f9cdedfa47898dc8be97e82053b09d67b069e5629a97c8276609b5a2

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