Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ef1d05269da8a9…

MALICIOUS

PDF

108.2 KB Created: 2021-09-07 19:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8827bfd13e6e63cf13e73f95dbe1afd7 SHA-1: 84acd779d760952aa8bf49f0d7d050f4c40dbaaa SHA-256: 57ef1d05269da8a9f35ceed7874554bc326c71ecdca1d4ae9f80504c07c695a1
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate it's part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbf29a514c---difaju.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8c426173---wenuviteledazuxajif.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/mafujulipibumagig.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/33435610793.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/kegupitemaj.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e9f6dd79f---xoxuzab.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/jicpjqbdoaifm12ku4qrucaur0/zabevote.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/fifufavakanitovubezuliti.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vewabelodinamo.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/22504190951.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/16231801525.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be775cd8132---5780191771.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd899b9548---51403048780.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/34151811526.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/61349856374.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68013795924.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/nojaxinereje.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/texumorekiza.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/62037664224.pdfIn PDF document text
    • http://kfbi.ru/content/file/81722808658.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/66881868034.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/norafebigefigezopo.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/rivudefixuxajifiva.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bdab88bea773157b2758bf51fc5d976a/53584073517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=argumentative+paragraph+about+smoking+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_off0001414e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414E 18320 bytes
SHA-256: 2decc330639624238b7b67e22e019fea41d62ffdadf3335e446914475f951bee
font_01_sfnt_off00017072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18889 11276 bytes
SHA-256: aa4df01b5042db23b5d49fecc6cf6e8749ac960d9edb31ebc77f04bcf3c658c5

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