Malicious PDF — malware analysis report

Static analysis result for SHA-256 38991e680941860c…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 14:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca0489a3364cd9a1fb0b15f784cabbaf SHA-1: 9d4d9b90c8ba80c993caf2ff303e1a58fe356c1d SHA-256: 38991e680941860cda59b55eb76c77340ba3e39ca59aefe6b440674ad52a9f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The embedded URLs suggest an attempt to trick users into visiting potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://doubler-son-capital.com/photos/files/25817052607.pdf In PDF document text
    • https://sibois.eu/userfiles/file/daferixodovozadaf.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19100976465.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/12971182671.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/jivaxetuwikaloru.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e46b3c0b---64952143226.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kuzog.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343b7492ac2---bozanezodar.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/94312239473.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/81455407321.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/93887003966.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/31503814671.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bebudodapalolamexirevapux.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109281657545569.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2da525c56---63576719852.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/82066327467.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/7331647317.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/61597893734.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e516474a4---dujunozipikixusew.pdfIn PDF document text
    • http://jin-hung.com/userfiles/file/25579513889.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/63888898292.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/1013858372.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/26251146141.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/febimepewudiloxinibupani.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/tulinefilupijipamamono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+a+part+time+job+persona+5PDF 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_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 17376 bytes
SHA-256: a53ab801e43d6192650d7a51e1302636af9c994a66b4729ae1956ee0f3c864ee
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 11032 bytes
SHA-256: 0f3b183096b743f1bc499ec15f06c6f53bdba5c3617649afe43ed1499984c9eb
font_02_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1