Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b5a69fe2f5aa14…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 23:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5fa5c7a4ed793f4ce7b6446452114b9 SHA-1: 46b6f1e792d6ff245c513ad5ea10ec233ea7666e SHA-256: f0b5a69fe2f5aa14e7568106f1aa27c6f9f684d77f8dea0b889010b2722a6ac2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDFs hosted on compromised websites. The presence of a 'download button' heuristic suggests a lure to download further malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=tap+tap+lock+gesture+apk+download PDF link annotation
    • http://finalstage.biz/js/upload/files/15311260824.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/2351818200.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210906_281FAF633C769053.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/88612691168.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336491009cb---26080003745.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7cbbb9937f553ed69df90a0cc9bdf893/bamatunojopibijup.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/tidirede.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb39274fa3---43839071651.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912000854298219.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/2424249933.pdfIn PDF document text
    • http://scro.ru/pic/file/sikisis.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/mifubijap.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905073430.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/wetufimobonulesaxaf.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/97781017942.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/korusa.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/lofenafuratokedet.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/68635903724.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/sawixo.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/bezebovi.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18313976795.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/35293323332.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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 10840 bytes
SHA-256: d48859b5d2bfcedebc758e76293ae2deba984a4c5c56dcd589d1866095dd59c9
font_02_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 19704 bytes
SHA-256: b9f06dc0ce936fc4232f61e01995bfcfd6ddd4a65ecdc2c151310b103e2029c6

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