Malicious PDF — malware analysis report

Static analysis result for SHA-256 b314930109a16e55…

MALICIOUS

PDF

92.9 KB Created: 2021-07-24 09:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1de9ab0f75ac4453f0535c83f2bc3fd SHA-1: c8e37a2e3097d5a208cfb9c070a8bd04aebdfe37 SHA-256: b314930109a16e55c7a017ef7a99b817edbd2a8d37366fe030b6009b99837365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or to engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/92cc7g60sjf2nqsq4onrqk7sni/41393629314.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf9125985---jujumaruwowijod.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e342ab031---jipifaxenewabunevetaladun.pdfIn PDF document text
    • http://sbkf.org/files/files/98701634060.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aac83837c---98072161464.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kidifuxaxaguverosa.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/28615870319.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/41c840da53329f8eabbc21d059896745/81189247549.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/23627716827.pdfIn PDF document text
    • https://bselink.com/userfiles/file/26966613955.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/dogojenegade.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072222ddca33---notexokofovitowilevej.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bcf4j8qq1vko34h4pdmrne83jc/88509974235.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/xukarileboniwosukuzowapes.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2dc954eaa61d61f4f6eb911d5cba1c5e/41071256696.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nowunofoma.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0129f098df328e5e2005826c6a6289d6/mujunisokusofixef.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964bb12f8bc---87238650043.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/83226927106.pdfIn PDF document text
    • http://ubest.ru/images/file/24890468295.pdfIn PDF document text
    • https://castel.ro/userfiles/file/73701597344.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/82091277110.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895cdb9c422---99131240253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+deflate+intex+air+mattress+with+built+in+pumpPDF 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_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11180 bytes
SHA-256: 9985dbee5accefe93a775c369527c809b58359b3f40867feeec6f4c3c6b8b647
font_01_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 17236 bytes
SHA-256: 1479044732fbd1e58fded1ee345b08b27da424f928172ccd5e9e355a66e2e083
font_02_sfnt_off00014a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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