Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7dde9dcdf663c9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 16:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fff623972f66d502ba0b7bed782f4f7 SHA-1: a63bb70ba4b0e72afd67182b69c5672c824babf7 SHA-256: fa7dde9dcdf663c9cfc85a9e6b622da89e4b9e0401134afce228b66f7b03471b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or distribute further malware.

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://coretry.ru/uplcv?utm_term=10111+binary+to+hexadecimal PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139db89c81af---vuxisuvaforuwonebuz.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/47427036545.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/76485406807.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16139684917ca5---17883407807.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/68150778057.pdfIn PDF document text
    • https://haidangpc.com/contents/files/83100289232.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/9597988866.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fowuminumiwosokagiz.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/sizubufe.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/60099213443.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/26047836748.pdfIn PDF document text
    • https://la-klamm.org/Files/files/49368535067.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57792196137.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/63513900161.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc7f1283f---4653948256.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fceb814172d57bfe2d767c343f106190/pexur.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/92521460454.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/94152664917.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/negubezomizepofadajetini.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/42558120095.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/34341742652.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/lusijovuravaf.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/pogufaf.pdfIn PDF document text
    • 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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 10900 bytes
SHA-256: 45e0f7e4334344799df9612d909f02ec479c1244e5b413005208d1ca26f2ce2a
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 17472 bytes
SHA-256: e138ba86352e5cb604ca892f9ab968c5d5a04f16456cc3482e5eec4994470c64

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