Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be7b52bf7ba2bf1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 21:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc848b6add129a3665dd6eb9a7cf9a40 SHA-1: e3464e72b18625621764bb8b6c5bcc23dbe628b7 SHA-256: 3be7b52bf7ba2bf157bf0991c4f57a758225be98c243596413f747324a02c7a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a link farm pointing to various domains, some of which appear to be compromised upload storage, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chiangmai-clean.com/user_img/files/317462870.pdf In PDF document text
    • http://hnkingdee.cn/Files/file/2021523153338.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/fulanimakiludet.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/xozidodenijojadafuga.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/pozarelimugiwunuzulog.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/86349103558.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/68602385415.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43751957594.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160854bf8a3426---poloxe.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/rivobuvubube.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/12b30d4219f25d0b461e65f773d09de9/94133904724.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa88b34cb---79910506018.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/qo8nfhj8k7kp9sk3uk4ko744oo/90739997827.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d07ac708---38185549604.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/gusedixajubisopolonid.pdfIn PDF document text
    • http://rld-carbon.ru/file/80954493587.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/17035293769.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///61828255506.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/58411999676.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/72611529435.pdfIn PDF document text
    • https://tipresentoio.it/images/file/93592221922.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607608b9711d6---42730173738.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/somogafixifeju.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/77665391407.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/23796450786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=we+raise+a+hallelujah+chords+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_off0000b5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 10736 bytes
SHA-256: 3aa3cc0d745a933cac75e4bac2bca29cd42f9b3ef2a9c7a94d12d00f27efe97a
font_02_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 16064 bytes
SHA-256: 289b5b0800d6e509ed99bf15252888f2bf4e12bff0a6d4168e5111d491ab691d

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