Malicious PDF — malware analysis report

Static analysis result for SHA-256 062862109d21f1a7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 00:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b09fc0ff4cefc9ce7b6ba5a274f59ce9 SHA-1: 42ce2ed353403f91fcf369883a2ba7afda8c0976 SHA-256: 062862109d21f1a774a5a445337cefa4fb417627ea8aa978034ad89865103e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to various external domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://upasamed.org/Content/uploads/files/ludut.pdf In PDF document text
    • http://shinhwajudan.com/userData/board/file/rigubipaferataxinu.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/94901353699.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/36964651621.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21949fe30---60651414295.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113d632a49---vasotuxu.pdfIn PDF document text
    • https://stormester.no/files/file/lekuxexir.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334a33b78cb---49482462391.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e215434c7---92520476295.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/9737360501.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613483953a260---19631185349.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/pawababerid.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/dubekij.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614115b366da1---mepulabunekatubewovuxiti.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf51945ca---23153701019.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/56992438686.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/niterawedetu.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/58529196645.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614112cca53cc---13156383902.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/29006245210.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9dc7a33---boberapitidoru.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/54938904649.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/bijikalupeniluge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=samsung+galaxy+s3+seite+l%C3%B6schenPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/35667409890.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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 17588 bytes
SHA-256: 15cef338d857dbd5c9f4f11c1b8e79aa8890d81dab3424943301d75f3115faab
font_02_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 11232 bytes
SHA-256: b398204da6bcbb8ce7a9d4294e59b4f8ef6c5b60ef0b67f9b45cbe5851aae61b

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