Malicious PDF — malware analysis report

Static analysis result for SHA-256 2866cdfbd3135333…

MALICIOUS

PDF

82.1 KB Created: 2021-10-07 02:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9ed0aa74a4ea2da649ed7a70392c641c SHA-1: 0fc3338142ec50e7d7eb026c0a43b110ae432175 SHA-256: 2866cdfbd313533308e58a1ad13e6706647907f2afb9ce3597fad1649042c768
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=sites+like+tubidy+to+download+music PDF link annotation
    • http://vipnjl.com/userfiles/files/keguru.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/wotofogezulona.pdfIn PDF document text
    • http://chengzechem.com/upload/files/23393593566.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/41078017706.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/ripesoduzurageviso.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/tizavasubi.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/kuxanutexabuxinaronojemaz.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/kuvupulujafetokikexo.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/18740204495.pdfIn PDF document text
    • https://angkagenap.com/contents/files/29235760544.pdfIn PDF document text
    • https://supzg.ch/userfiles/files/26427502313.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gewagulemiwo.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/wofujatobukuruwabi.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/10542885701.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/30134392889.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc8234499c---74765191051.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441a10c492f---5629003917.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/18599972256.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/jexubiwojikomipavi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a598c787---62634443197.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/22976391362.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/98161796204.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479a01adbd6---ragunujevemoka.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 11036 bytes
SHA-256: 11cd02015cf93e8f821464b44115edbf3d32fc8ebed69f0cff6289395dc46241
font_02_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 17812 bytes
SHA-256: d3602a1b7ada200bdfc244f8eaeb140dbc57c277fdff4ae7ae53c7338a278c9b

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