Malicious PDF — malware analysis report

Static analysis result for SHA-256 407519803915b904…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 15:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4b9d6760a8f5a942b4fec34427996a2 SHA-1: 5566adff6610d383707cdf0d9b80f67476b18a40 SHA-256: 407519803915b9048ae48e122fe02ddee89fb30f6d19564ff1830b9fad88c206
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://qiangka.com/ckfinder/userfiles/files/jiraxid.pdf In PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jomegefenaleronew.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nfkannnj9ihl4bp6q3akiqh9i5/72906608403.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9af705e2---pakuxefotonoworiduzufawe.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/felebobuma.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135054cc3d4b---bimonum.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_0680BAC06EEBBE9B.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/lexolozodujamawawu.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/wigatitu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1c8c176c---gomilesokik.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/womefudukukuxu.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/99978692434.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b01b514e3b455dd27ba43a3f90df68ed/97143784121.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1265bc156a2bf4fcf663882c7a6205c3/10472506676.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/69037866813.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/52121370315.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b95a1a7f---25103419074.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/kiwusowuvafuzuveguro.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/55147961943.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b707e1ca---58800077324.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/kisapaz.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/gevifibubajule.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27779658636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jail+breaker+sneak+outPDF 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_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 10424 bytes
SHA-256: 7f53f5c74f3197b56e743e470b40c4b4975b98db994ca49e08da1a9742404e48
font_01_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 17776 bytes
SHA-256: 293415299a7718c86d13e9a5d3e081ca712aff1edf8ed362c45bcf91214831b6

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