Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b16cb4b58e7d7b…

MALICIOUS

PDF

96.2 KB Created: 2021-08-11 19:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 253d0c7d7510e5ca46202b763de58cc6 SHA-1: 1d8a15b6dc92765cb2b03d48ddca47449f4c8f7e SHA-256: b4b16cb4b58e7d7baf213b93f5d29d7eaa5479a518afa15ba11a4e50665a2938
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term=how+do+i+get+a+voucher+for+housing' in one URL hints at a potential lure for phishing or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://alfavs.eu/userfiles/file/wipafe.pdf In PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/xulekifevisuxokorog.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/88095192929.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/napamagugos.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/57505537378.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8ed1a015a4835ef29726e5116328ed9b/67930974566.pdfIn PDF document text
    • http://moristas.com/userfiles/files/worudamoz.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/54ad31655489182d5ba938a2bff04ef8/97123105495.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/pepinapurijuje.pdfIn PDF document text
    • https://synersys.fr/contenu/file/36192125512.pdfIn PDF document text
    • http://irollee.com/userfiles/file/jevuzevugifevuvanosobixi.pdfIn PDF document text
    • http://change4best.ru/upload/file/numaxeluzeveruri.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36a965c089---6944322733.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/resifiwerowovijo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1354a6999e9d7d5242a684eb81dbd82b/98442466047.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/46481414464.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/59242207086.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/98646283233.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6115fd1a408859c4376fd3c2e26d6738/63102912823.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0bbabf1aeee1a7aaf5b94df2f34701e2/7232992714.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9419e5328---pivepekepanexanuwi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be0e5e4ff11---badarizarexagule.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02c8d6d0d---71293529105.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160958ca7bbea8---42178232470.pdfIn PDF document text
    • http://ubest.ru/images/file/21505192874.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/24922301944.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0f1b65fa6fb87be23902fd44168af576/jesakunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+get+a+voucher+for+housingPDF 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_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10952 bytes
SHA-256: 04acee37c2487bb2c7f3779070c49b9bf22bef7c7adb1bedf87fa5ba16e58353
font_01_sfnt_off00012ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E8 16892 bytes
SHA-256: be8da2beb9d194e41dd4a9d2590729722fe203b63af77b836a358861504a51ec

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