Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba3bf190b6bd862…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 19:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f795ea9bf49f3d19ff6e6ea9e0928478 SHA-1: d300c082b55ec931c6fb8f93a3980fc5398f6972 SHA-256: 4ba3bf190b6bd8626570e08b18db5b155484483179c1a4f50d1a6ea602ab24d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://faradtvandor.hu/picture/userfiles/file/18090744710.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca84a4d6a6---wilev.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/1894687344.pdf
    • http://hgbs.de/userfiles/file/ketuwisimumizidutenevejis.pdf
    • http://kommunikator.nu/demo/userfiles/file///gegeviviretexodosinibe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130279d7d44b---34543971054.pdf
    • https://ubitanduk.com/contents/files/81966828563.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/18903706905.pdf
    • http://fsoa.cn/userfiles/file/45461496028.pdf
    • http://szentistvanpatika.hu/upload/file/meronilopifijisilevose.pdf
    • http://instit.ac/ckfinder/userfiles/files/bawurijejuwoxuzaperol.pdf
    • http://doingthing.com/downloads/blog/geust/files/tegimapuforava.pdf
    • http://dilimkebab.com/userfiles/file/63564257378.pdf
    • http://bamila.vn/luutru/files/15836186210.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161351627b3b86---zexim.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b70d5b1a---7392078355.pdf
    • http://aurora-c.jp/files/files/12237166798.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/99734461023.pdf
    • http://conditum.nl/userfiles/file/nupekirofepolinifom.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2q7tgmqa41p908epr1baav7mqm/gogugepugezofuv.pdf
    • http://alfadent-volg.ru/images_uploads/files/96273207062.pdf
    • https://estoniapools.com/contents/files/zewikododitafomozir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=alight+motion+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e424.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 16792 bytes
font_01_sfnt_off0000fc3b.bin
fc07c6ed560b6dd7e4f900a626328a4780cceb66ba79c5e6b8277b3362857cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10240 bytes
font_02_sfnt_off000112f6.bin
0f9d406db592ffc2aa766a397eccb38593423aaaa01a13368f418790f6b12ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 18052 bytes

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