Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23c88c02f8a1c9c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 06:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e29b4fb8b51a09886a10840ce8efdcc7 SHA-1: eff09363e95d22546fac95a0d5bf97ef66d07f4a SHA-256: d23c88c02f8a1c9c033be0293cd476cd1eb2faa6fb9a7282134834fa9f53738e
164 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 a phishing trojan. It contains a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malicious files. The presence of a 'download' button heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://ndmoyun.com/calisma2/files/uploads/xuzaf.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/gafovozekere.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614541f767a61---94413071445.pdf
    • http://2safe4u.cz/UserFiles/File/82281866372.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0415f9af66f81c2b378b74270d69b09c/31547111567.pdf
    • http://srilakshmienterprises.net/uploads/rinelimumelakisilelug.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/1763670218.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/72711413533.pdf
    • http://studiolaviano.it/userfiles/files/rovadaz.pdf
    • http://atmaircenter.com/lb/userfiles/files/30055950636.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161425e82aa0d6---48334737575.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kenujanuzekozilerofenug.pdf
    • https://milsagliksen.org/upload/ckfinder/files/pomukupunile.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/52e2272d60e992c6ac1313d3492bb8a5/bedilijalu.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8987574da972b796320bbde7b4098054/sosabifazisepajifetemez.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/99581055624.pdf
    • http://jatyn.cn/upfiles/202109/file/1630700444.pdf
    • http://fonnepal.org/userfiles/file/40596497162.pdf
    • http://iburgisidimarsala.eu/userfiles/files/limufop.pdf
    • http://vodnik48.ru/content/file/56588526447.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/zileruwa.pdf
    • https://ikitellirezistans.com/upload/files/73697892966.pdf
    • http://topas.lt/userfiles/file/dibakixivaxulone.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=call+of+duty+modern+warfare+torrent
    • 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_off0000d7df.bin
5ede4b957611b8dd6c9788f35487167982d0afeaf2932298b716f19be4f5f867
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 10588 bytes
font_01_sfnt_off0000f026.bin
b68f356759712b5261712bb0862f9e0eb1ec5cb3508bc1736ae1f5bae4707b35
pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 18564 bytes
font_02_sfnt_off00012031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16792 bytes