Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38e62a951e222ad…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9d63b5acf96d5dce5d26b6df61724c5 SHA-1: 0026be047f77416fa559363ee060f723b894eace SHA-256: f38e62a951e222adad31aa5346ff055d363f1fd71bbb2f27db0659bb5a67b766
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.channeloflove.com/ckfinder/userfiles/files/faxozu.pdf In PDF document text
    • https://agronlogistics.com/userfiles/files/91892189224.pdfIn PDF document text
    • http://warehousetraining.ie/images/mamavugowe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3eaf51793---63521295098.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdc6dbd4ac---sugixopekenavagoseke.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/visedinirezidu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/19576039223.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/81694406734.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d641b5e990---vozafeluraweba.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/pubifikanazamuj.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xuxodakazozujagurefutuwe.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/96101263491.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/xisavuvapinuzo.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/witavutalemijukaz.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xedomafeviporobapugononim.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/10930211056.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/45950161325.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/16892750977.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/16536802901.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc2c98984---reziveva.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/73621254621.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/22887160597.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ad8326d1---rafodolup.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/xudararonipujuxugival.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=difference+between+smart+tv+and+android+tv+in+englishPDF link annotation
    • 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_off0000b57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57A 17396 bytes
SHA-256: d62a39a0df89fafafa6d439722e5efc9f03b134a9278650242c51d3e79f3922c
font_01_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 11216 bytes
SHA-256: d4358ec48ec83e157b864262e43edc83e5eae1435297460c2f7931d6b633b779
font_02_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1