Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a9cf3fb6682fdf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 17:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdd5fc2cfeb9970c5f8221c4af24a21b SHA-1: 99176a208dba6bcf466386e4f52a2974af7e3f5c SHA-256: e3a9cf3fb6682fdf9d7758273d4028ec443b3111ac1f0e182d38c36ab8ab2ba4
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'SE_CLICKFIX' heuristic indicates social engineering tactics designed to prompt user interaction, such as pressing Win+R or pasting commands, which is a common method to bypass macro restrictions and execute malicious code. The embedded JavaScript likely facilitates the download and execution of a secondary payload, as suggested by the 'PDF_JS' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://archism.ru/uplcv?utm_term=how+to+connect+redmi+note+9+to+pc PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/26a3bba7ccf6e9729179036df9128a7f/gufakidapab.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/60154585138.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/42451872170.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/lolotitumura.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374be81a855---83565791004.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/72041495694.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/doronefav.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb991e8d6---tiveriwokoriditur.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/puzufotejonezobifoj.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/91407538547.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/96742991016.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/78837149100.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/paketexixisexukejuxupomi.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/zojomaxagodazuzufikulebok.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd751320fa---nujatitetimesowigedena.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nujexesisatugir.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/sikimilubasemewutib.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/76788827615.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/valujafanumuwa.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/duwofes.pdfIn PDF document text
    • https://badoza.net/userfiles/file/witapidigukubiserube.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/49621984366.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab256fec8---95566133036.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/17702545350.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 17944 bytes
SHA-256: bfe6112d5a5c847683211e5ea29c9c6f3b88671d1771efd3a82fdaef05854c45
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10544 bytes
SHA-256: 6719afa8b6a665e4b3dc9d5e4c8c2b7d5625a5336e9bcde240bcbd9f455116cd

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