Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8520f3c9615188…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 08:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a03a045d7a1714486cf8540c714fee7 SHA-1: 2b49981df0726a92b92c6a07c944b99cb38ac707 SHA-256: 2e8520f3c9615188fd7903055e7837f337ecc0d8726974b991f3fc6167e2a1ba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zrdb-drogbud.pl/Upload/file/39637357531.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pcierp2flmsddmqdu917s84dr0/romawoxomosomavagisuzulu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c2be7d92448111f7ea7fe89f01f42a6d/worinebeka.pdf
    • https://tecnicadovolante.com/images/file/89369851149.pdf
    • http://archerelectricsupply.com/userfiles/file/kesubasumex.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201c150afc---tatepujidufizuxonileni.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e2fdc2b49ce6f45f7b91cbd114c952a6/diwipopeju.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-20/20210520013456496931.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/69371847827.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6705ce5a3a06ddd886bbff9e678c67f1/94616387295.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6c9cee97---56045971978.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/667f1c7c39ecc18626892356907abde5/zozitudawigumixodan.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3beb5a988a---giguxilusobizazaxe.pdf
    • https://dolmalatrek.com/userfiles/file/8908315852.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ab9b7257---95573622915.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e652e9aa2---64261958958.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc9435a5c---17135695172.pdf
    • http://aep-tc.com/cache/fck_files/file/46543176816.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rng59pq2l7498ss5ct7oopiskv/lobake.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169905a40a---famekesidetifukevof.pdf
    • https://baxsporthorses.com/userfiles/file/fifonen.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/384c62a857a7cc35f83b1472e22c6a8a/68649769237.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kjhqdn0bh5s98ndnrmuacdmhn/pakukoren.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d499713fc12c8bd29a559ba5922fc408/98447020098.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=51+out+of+60+as+a+percentage
    • 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_off0000e975.bin
ca921f1452481c5daafff15accaead1e430f7e31079d6b781b5526516b67fb18
pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 17396 bytes
font_01_sfnt_off00011734.bin
4fcb6037361eb2f20e4463bcdb52a7ec0a4c064457e38c927d7f603e905fb5c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 10996 bytes
font_02_sfnt_off000130fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FB 16792 bytes