Malicious PDF — malware analysis report

Static analysis result for SHA-256 024a57b959102775…

MALICIOUS

PDF

73.1 KB Created: 2021-10-04 00:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4cfae8661203891f96d607484a92e687 SHA-1: 3b3ade3d6b1fad881289a85139543e3ae7dd4acf SHA-256: 024a57b9591027759c9f307f2db8d58d2029cba9f7f676da27095bd61f1f1283
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for delivering malicious content. The PDF also features a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://synerhu.ru/uplcv?utm_term=oldest+parliamentary+democracy+in+the+world PDF link annotation
    • https://esz.jp/img/editor/files/moboz.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/sutinuwogade.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kuvirifunow.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615861ffee739---bexamajeno.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/lusofefir.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/70708712968.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/48870767416.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/39108747880.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/moxifokinar.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8dd0b2f0---93568469108.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/42981798519.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/tapewa.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/73955857582.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/28773352600.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/63032209450.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d685ee25---gabojaj.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/23114910395.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/51600479397.pdfIn PDF document text
    • http://kermiradiatoriai.lt/images/files/tuzejog.pdfIn PDF document text
    • http://www.bash.cl/media/file/20789064212.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a1d3ee0e---kebobapikibekuli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb72a993---nipuwewiresuxo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16155fc68be973---gimunadaxip.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/43307099925.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/bilobibajazad.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/20107657366.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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 17164 bytes
SHA-256: 14424955e4251599f62a852ed8ca8b9c678676ade7cedc6b4667de9189c89ca8
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 11004 bytes
SHA-256: 67d46e3b413776de54bb7801b2d665222e030415a1064e6c562bdbd341d82e06
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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