Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa73c378edbc331…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 14:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82ba1ae1385bea6dae8d4dee10ccf43f SHA-1: 85068e489eb41645a47eae7b4c738a98b34d8f6a SHA-256: efa73c378edbc331a9ef78fc4722d76f1b3c5a5636b17b14245c1c71a3a37b0c
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and is structured as an image-only document with action triggers, typical of a phishing lure. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress upload storage locations. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://duz-drustvo.si/uporabnik/file/88093217625.pdf In PDF document text
    • http://okuninka-biale.pl/userfiles/file/binutimozupigolozedupedaf.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/zipopadekizavava.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55da1d0f1---63092881448.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xiwivutisamuguw.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/47966766820.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_054631.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090806325453.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/42006918392.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/65543836791.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/3255088950.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/35872913566.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/578def2d9575f75d68fa53631aa12139/71426420544.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/rofedovevomafibuwadupe.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/vedesemudaxo.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/36786000539.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/kebesadodararerakusuxufus.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/1865453030.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/mufufonepiwefi.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/44835322190.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sofinet.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/vuwinovaxorupovenejone.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fab379c28a4e44426105894689bd844e/robuzanupetutux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mechanical+vibrations+5th+edition+pdfPDF 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_off0000b0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C2 11052 bytes
SHA-256: 642c35cf1511f54ada89759919d5c065fbbf095e728b3c67f0556c699d0a2bc6
font_01_sfnt_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 14048 bytes
SHA-256: 81a580737b5b20a370d1eef9c0b94b1d36e7870c3133a38867d1de8c14691445
font_02_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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