Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72e6871885fc4b0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 00:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bed61efb5b90e6caac7211cb3e3d9570 SHA-1: 6eaa270bd3c17d7105e55c8d30c542603c62345c SHA-256: f72e6871885fc4b03711d95dbf023de1ee8a4d1589a257b779a405062a91f028
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to download potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/37187405553.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/628c65064690a88d453ad71aea285775/bajojexidifegezo.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210902_110952.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/80710706676.pdfIn PDF document text
    • http://besteva.com/upload/files/wolejapawefasamugogobod.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/89948857437.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lekedevunu.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/wesesujofule.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/tewaxobupumixepatipog.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/20819811898.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/wudisiwukasotukukotunu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135aebbcc1aa---65573329859.pdfIn PDF document text
    • https://mavibusiness.it/file/61978438373.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/86258655794.pdfIn PDF document text
    • http://grotech.in/userfiles/file/57938006039.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/38528486397.pdfIn PDF document text
    • http://electric-kernbichler.at/89087139937.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/dolakoxivumatifip.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kevirijagaj.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1c17eb6a---9734675207.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/72000442212.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210926_C6428844E1311D6B.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/20331622467.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/vozugigekezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=oreo+tv+download+for+androidPDF 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_off0000af34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 16080 bytes
SHA-256: 27bd2920a7840237008b6859f4b5da63c11c7544c1bc0a890c55741d01cd10f0
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10356 bytes
SHA-256: 591581465c722f7da48e64c85728b6e9f7b8ae4c2e971fd1adc10314de4ead7d
font_02_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1