Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f11c624b05cdf13…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 11:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f2215f1e93af56d9595a6c8592a2122 SHA-1: 906e80c0c7712b5a2869c5d51299084c519aff40 SHA-256: 4f11c624b05cdf13c6ef37e04bc4c9778349709b92940c855227ee0a87b8b0d0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage. A critical heuristic indicates a lure for clipboard command execution, instructing users to paste content into a shell. This strongly suggests the document is designed to trick users into running malicious commands, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://pixomot.ru/uplcv?utm_term=convert+m4a+to+avi PDF link annotation
    • http://yousefmaktabi.com/ckfinder/userfiles/files/59105680305.pdfIn PDF document text
    • https://mcsfood.com/images/file/degaziputifudizutemo.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gasux.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/jegikoriv.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/60334716458.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/movovikutetebor.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/42198563453.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc8a010f3---gawaxolikabag.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/40998558394.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/wunomesilafelivepulawe.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///kugujifidopibiwov.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5u5u6rmuo301gssqt3j8h72vf4/96880482166.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109050954224465.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/vapugakifojezixukelofo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8fe870cb---benuwurajejuzej.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/ponawogirexanid.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161391c4c97f01---leludolizomugatedipedexe.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2321d6a8---rurozelekepuxojavo.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jatunivofisexuwen.pdfIn PDF document text
    • http://irinabailey.com/upload/files/66196354985.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/49109194224.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/xaragefuxeziduvipapadof.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d0963974538f627d2ef6409cb09b53e2/99444889886.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/11709038003.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 17392 bytes
SHA-256: 1fa31dfd030d572083fc06a8b5caba837c192bdf475cb5988260de94c6af9961
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 10228 bytes
SHA-256: 99a0309ebc49c37567b9fa37b41e047a75f69385b2145e73d06c1faea46d1b3e