Malicious PDF — malware analysis report

Static analysis result for SHA-256 9578ceed4af59e04…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 21:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd40726cc1033c8128f578827bc184b3 SHA-1: cc9b0b97fb9e79ecf5aeb74c1cde162843951ee9 SHA-256: 9578ceed4af59e04788ab1f2918f5471cb1fcc47bce7fd545d6078752dd74906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090257cbf09b---12790017094.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d510f0817---balaroxudepebopudupiparib.pdf
    • http://wefocusdesign.com/upload/files/duladoroverurani.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3lfkh68shbbd5hfj11ft7o4g5r/luwupizogisexelebilewozan.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/06a84600ae98f23775d31d4430b57803/binoxumolaji.pdf
    • http://zh-huaxun.com/uploadfiles/files/balowakikasimaxamobifixep.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/714fdbd7b35996370545f4b89e7275a1/valupufas.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1c8e5213---mobubuvuwala.pdf
    • https://tramtron.vn/uploads/files/files/14656298014.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lf1j30icvdi6vstpfq1dgtkofa/xorazuduxam.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f512492fea885655ae1bbe861456268f/nasaxoxanamo.pdf
    • http://av-jet.ru/userfiles/file/74008195978.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f1b5b5fb8---jusafojajokelazedepapose.pdf
    • http://mamnonlittlesun.com/upload/files/wulikap.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085e984c4f8d---63641767644.pdf
    • http://nhasachthunam.com/upload/files/80610509287.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/55680710552.pdf
    • http://mdfgiare.com/upload/files/xilujilivagezopuwupi.pdf
    • http://creatinglifeoptions.com/userfiles/files/jaxebun.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/te1lrklkcsp31qu76p8at0c5s7/72533589966.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=manual+iphone+7+plus+camera+features
    • 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_off0000dd81.bin
e36851b3f61d3185e0953b4962f6cd7b131cb2b6d53a089eaaff275cd45dbc60
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16740 bytes
font_01_sfnt_off0001087a.bin
9ea8bf699751630c927d5d9655133a79cf22111f9b1decba9941c764dc38b9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10888 bytes
font_02_sfnt_off00012181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes