Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88b3fd928e59b37…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 13:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8592595c25cc03e82bf0068e3b18c869 SHA-1: 323a6164a62bdeb7103fef1a32fbc2f1f0ba18d0 SHA-256: a88b3fd928e59b3716b51954ecf7c29c3f409187afa2da4c997556a7df127483
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on disposable domains or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://madmojo.com/fckupload/file/zelarerog.pdf In PDF document text
    • http://elijasprojekts.lv/files/file/gawaxumexevuketalatate.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/28988014555.pdfIn PDF document text
    • http://xenangheli.vn/public/files/vavofewubejogesa.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/54732178736.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/91305542155.pdfIn PDF document text
    • http://chinahongji.com/d/files/74530178637.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/84467234824.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/7897120518.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7bc8927ac42cdd248285fa986e2e2dcc/dinebalumuj.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/degofaturezesalib.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/xenevuvupemoxini.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gogavewubirobu.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/kisulazuvipupavulo.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/gawijofosubufuropekejebo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4l90guhhnduo541srmoivsh552/jataxaporufaga.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901185929.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe7694864---73300162064.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/zasege.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/ranupalo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/37873191737.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/67784120319.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/89080925891.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/42627617665.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/39212596396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+imei+in+android+phonePDF 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_off0000b012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 14632 bytes
SHA-256: 9a7978192983749f555ba49bc4942d9a7f1b538edb2ba795a3f507c975835adb
font_02_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10628 bytes
SHA-256: fbc29678b4ce99fcc6f71a53110a3a79781dc4ea96762e98d65945d9a0133708

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