Malicious PDF — malware analysis report

Static analysis result for SHA-256 638958752b8e66d5…

MALICIOUS

PDF

81.4 KB Created: 2021-08-22 07:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b948c47889646bd07760569a782d2343 SHA-1: 9b48dfa7b297cf01ac642ca0d3216bfe0b70d4dd SHA-256: 638958752b8e66d57aed6897b93c43f8cecbdb5160284b8ca7b40f9a3d874beb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic firings indicate the presence of embedded JavaScript and a link farm designed to redirect users to potentially malicious content, likely for downloading further malware or engaging in phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=mini+militia+hack+version+download+unlimited+health+and+ammo+old+version PDF link annotation
    • https://108pizza.pl/uploads/userfiles/files/mifigudisaruxez.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5141764608.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/417818a1a2af56547b4aebb9602ded32/26359479802.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/4341129859.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/1658674013.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/dubosubajifigekujasajak.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/38820940185.pdfIn PDF document text
    • https://webmenuplus.com/images/file/roxixudezufi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110b8256999d---losajeguve.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/1319391785.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/3221812439.pdfIn PDF document text
    • http://alkanboya.com/files/file///63751991737.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/zijur.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/75808484740.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080291a29961---30456168918.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f6f46b79f0211525081f015f7e8ce277/13797622878.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219d6f3a377---woganasaboset.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/40309748141.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72247939538.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fikinemevifazodiwupuf.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b75cf5afa9df05b3b642f3903f243325/99027676609.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 10972 bytes
SHA-256: 240c9b3bd59b135789aedd92530fcf39b5c368ec3af89ea4dd7ec3b84a1bd9ed
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 17232 bytes
SHA-256: 7fc2f4bf778050b798956c04a71225852799b1a9296c525d37769f98d6713922

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