Malicious PDF — malware analysis report

Static analysis result for SHA-256 724dd61a30a9ce6e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 00:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 082eb2e10a202dc0b406382f84497789 SHA-1: 58bd4fea2108b04643954a796d836c0bcb973ebc SHA-256: 724dd61a30a9ce6e669a76fc795094d04aa8eacdaa951ff60ff3ecf6b1285fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=eberron+player%27s+guide+pdf
    • http://templeton.sk/userfiles/file/13005422406.pdf
    • http://tfforming.ru/d/files/51818618552.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/42844563192.pdf
    • http://rspon.pl/images/wyswig_images/file/65155175128.pdf
    • http://cbstav.cz/file/79546009431.pdf
    • http://swissies.lt/ckfinder/userfiles/files/tofovubeliwukefok.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139b84abaa9d---jatuv.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/91340b08aa1bdacbedd74b65e93bdf24/48658138782.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa5f6baa0---nutixev.pdf
    • https://verandapattaya.com/userfiles/files/89286962005.pdf
    • http://floral-design-lindgens.de/userfiles/file/zimajovobotegidatenu.pdf
    • http://randoquad72.fr/userfiles/file/71970822208.pdf
    • https://tybistanbul.org/resimler/files/dagaporuvanumegapibud.pdf
    • http://spellenindex.nl/images/uploads/39644902851.pdf
    • http://saluteebenesseresas.it/userfiles/files/naremoxujiwopezadonojigi.pdf
    • http://dichvuhieuchuan.com/upload/files/pikisakexafubobizar.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433dbe03748---wutajomuroxepevarudowozof.pdf
    • http://hanasushimenifee.com/uploads/files/25065706729.pdf
    • https://resttour.com/images/userfiles/files/dapivemudusajix.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/lewepatojekuvogosizifadi.pdf
    • http://asztalosweb.hu/userfiles/file/lojini.pdf
    • https://rmp-familienanzeigen.de/cms/files/vubopozadosuwogaka.pdf
    • http://ohdiabo.net/images/ckeditor/files/53415857104.pdf
    • 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_off0000af0d.bin
e7c8e13b21dfbef3dd2f5cca1f01fec03f2be5a8220aa1b2fe176a8cefa543d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0D 10944 bytes
font_01_sfnt_off0000c81b.bin
89badd93992304f43c391ce081ac12e4371e3b3671b2a60b58e9d1f68645d050
pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 15096 bytes
font_02_sfnt_off0000ee44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 16792 bytes