Malicious PDF — malware analysis report

Static analysis result for SHA-256 803c1020d7083b38…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 17:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f121549d52f33c1354b50c3c0f8d991c SHA-1: 00798634e769b4a198dd4c1b6b41dadb2ce39f26 SHA-256: 803c1020d7083b387d1e83023293ff3c466c4a90b36e15449def7b8fdf67fd69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=pound+feet+to+inch+pounds
    • https://systematix.pl/userfiles/file/savixinukisalakevow.pdf
    • https://easy2ticket.com/upload/files/leleji.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5l83kkbrnte4e41vqltj3g49a3/20457257758.pdf
    • https://morganmethod.com/ci/userfiles/files/nodunej.pdf
    • https://martensmgt.com/business_school/uploads/file/75520635758.pdf
    • http://younewstoday.com/task/userimages/file/24876138784.pdf
    • http://bioident.pl/photos_fck/file/gedafazikoteki.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a431dd0d50c5391c5b06f85bc2b63120/volawuweguxotavu.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/09d51b1f436c2c2496ff135938d8f293/wewaronetunesopubudobaja.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/33629175421.pdf
    • http://sotel-perm.ru/site/file/ronadisetumofutomewipalex.pdf
    • http://daydreamspin.com/userfiles/file/zupemom.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2f0b364a88f12c3eda3b3d6d1d693385/86878468641.pdf
    • https://flyingfish-stay.com/userfiles/file/pinajumam.pdf
    • http://ridendo.cz/files/file/jomobipumokoja.pdf
    • https://riwg.in/userfiles/file/walurukazineweturulobop.pdf
    • https://papiratisk.cz/soubory/62595019789.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b139e4a8a---lesikopaza.pdf
    • http://lapenya.cat/imgjovesnaves/file/88354012900.pdf
    • https://ksboutlet.com/file/files/winunesud.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14892364199.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daba.bin
aa0eda75963c12e220465842dbb7b5db90b18561b771304d036173a1ea5b3666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 10508 bytes
font_01_sfnt_off0000f294.bin
afc891465c9f96f22913f8cfcddad83e2207c176d3d19a499533763ad50c450b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 19080 bytes
font_02_sfnt_off00012527.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16792 bytes

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