Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c59d2354091af5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7047dd075fdb6bec949307f9e7dc6aaa SHA-1: cc1b1132345abcfe2b78d64e0227a1eb20bed75b SHA-256: c8c59d2354091af5ba31a9c6f4cbc1d3542b78c07904c8b412be82386ab84cc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to compromised CMS upload directories or acting as link farms, suggests a phishing or malware distribution scheme. The primary attack vector appears to be a malicious PDF attachment, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mygo.com/ckfinder/userfiles/files/xuwefonipirejep.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b72d16aa---dupavezivipuded.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/62222583004.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/99b5f6ca91b8c1aae560baf43e2fb1e0/56296261106.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fumivibimuxemolinu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/gekoxigojisugu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/51525634036.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00ec27fac---65512141960.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/tavikulifexara.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/93868916299.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/togipi.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/38274034448.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/31245702758.pdfIn PDF document text
    • http://yilip.net/userData/board/file/purasini.pdfIn PDF document text
    • https://dm288.com/slicice/file/josalepadaxefaxepuzo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9998cad214---lewamadibawufi.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/kavamiwetuvemonin.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/u7vmca810eokvdoocufjpf33aj/30974719385.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/64920846456.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/54791446651.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/dikezeziwabovi.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemalimonepenipolop.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d482526d9---11350151251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=george+bridgman+pdf+freePDF 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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10708 bytes
SHA-256: 79b1675dc15c7c71823da0ac6c093f6d177090dfd0efa5b110fbb227848a7594
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 18212 bytes
SHA-256: 8701b778bc0fd2aacdbdd128a53a5926546ef21c61ac9d2eb4d17a61064c419e
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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