Malicious PDF — malware analysis report

Static analysis result for SHA-256 787928b6cce05198…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 11:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6700283ea5c29f222146103a06113d23 SHA-1: 9aee2e2b3b253d2f8e5b33fba6a41096d792d69f SHA-256: 787928b6cce05198143e9a8b6a6270e5162f7e3dcbeeaa7628b48233593e4af1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=advanced+english+exercises+pdf PDF link annotation
    • http://ccspatti.org/userfiles/file/niverejelimixosufej.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/lozekol.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/29859023547.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/98700239979.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146da7b11286---30259064813.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/potep.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/23000989887.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/86508645135.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/duruwipurovinuseb.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/86566929774.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/fezoziwabekawomal.pdfIn PDF document text
    • http://www.polni.si/Images/files/5831856899.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/56641081795.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/59951217559.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/394efa45b2aaaa5068bcb07f3e58e819/51644485441.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/85978468808.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gesuti.pdfIn PDF document text
    • https://bdata.vn/upload/files/28202891079.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614466aa5d3e5---xekazidebi.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/58995060386.pdfIn PDF document text
    • http://safetruck.gr/images/file/60246101747.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109201624298509.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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 10832 bytes
SHA-256: ef74b3cf4fca3d3f6fb9cb5cc61e420026a96881bf1fafd3cad92852fecb23ad
font_01_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 18204 bytes
SHA-256: cb27709d1016f7ebe738e6a7ddfb237062bdeb221424bec6fe085e5478a87fed

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