Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ed85b58a7ee9f9…

MALICIOUS

PDF

94.1 KB Created: 2021-07-03 15:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9436a8868a8f5b7f9dd7fad195b6d85b SHA-1: 7ec09d3838a28d2e30bd8759b083c7613ef803b4 SHA-256: 78ed85b58a7ee9f9e5730738bb8194ccfd6087e705fb6941dcc59ef6f990467b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=five+example+of+arithmetic+sequence PDF link annotation
    • http://katyababash.com/images/uploads/file/29561480038.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jefekokenunegape.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/13454630789.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/38312691000.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/h52qhgeqdenp0aeb89d27rt5g1/lodutojulabe.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080567345880---sepesenoridibenedif.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a2fe02ef---siwizot.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/81451730590.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa8dd2cb6a---70969624228.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jnepn1hga2e8uh87vh4a551ldr/26009168758.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/sataku.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060313363593.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a1085627---novigudabetuvirut.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/7466554315.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t3nusmta0g1iai8kq9oqnkvjc0/65086279473.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/14bce31bb4fcef299f63a32d6ef27173/48958325541.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c17b2928b---vibusu.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/47484670642.pdfIn PDF document text
    • https://service-panev.com/userfiles/jawivurodudujefilaruja.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/43807350459.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_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 11136 bytes
SHA-256: 0e6cee1c9ba92c0e2cc09a759c9be01d2c713184c1e05aaecba05597768279cd
font_01_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 17780 bytes
SHA-256: e7d7e996b15cc76197d2b2cc776fb2822857935cae0d6b384d1352050ee52206
font_02_sfnt_off0001531c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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