Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c65879908c6bd37…

MALICIOUS

PDF

95.2 KB Created: 2021-09-19 08:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f737f158c4b83d79d2bc41fd235d1a4 SHA-1: 968bc90afbdc8b2bf728f1b67dbfb6ea5816e076 SHA-256: 1c65879908c6bd37adf04218a58fd6c367ef5098c639446065ed7db5fb88eccc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=throne+of+fire+pdf PDF link annotation
    • https://securitydm.com/slicice/file/nudewowubojoserojotan.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/sopakusope.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/66729019657.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e9b040856188e8dc278bb5e4c41f675b/vaxepasapisetavagarifa.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/fonisufibulupilobevi.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/60901202508.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/movinaxaxozir.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/10367994897.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/gotebolinupuruloga.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/92117266879.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/bulipazasejevimevupuz.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/49943436184.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/68655930655.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/bususexiroguzenek.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/muloli.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408dd74ed78---96066863527.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/kigetutefodoxekadaru.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/79145637005.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/11721660132.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hp4h8fs1d4o5v0mbi8ktijod5i/mebuzitifojipowuvawe.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/vazilewemofizuzo.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dumobigi.pdfIn PDF document text
    • http://altus.pl/userfiles/file/rivodosirafixujix.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/22657863834.pdfIn PDF document text
    • http://beijingteye.com/upload/files/wivofizesebo.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_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 19648 bytes
SHA-256: e4a9caac84f036af1366b3c6a10e5229a46c7032c6c6704dcb63d1646adf013c
font_01_sfnt_off000140c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C0 10084 bytes
SHA-256: ef250db4b358247db3884f748c4fd1781244739b30db6f83faa4b2f0781ae90b
font_02_sfnt_off0001570b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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