Malicious PDF — malware analysis report

Static analysis result for SHA-256 032633a0f55b0c87…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 06:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 420dd94903a0b70dd0f5fa2f6d39cbd5 SHA-1: 22a98230712a96518b2f7c81fe34c53365510b89 SHA-256: 032633a0f55b0c8757e69d5184238aee0e10bf2ec60bbe3385c5f7730632d969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://saya.ro/app/webroot/files/userfiles/files/banowojitenakekaj.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/zuvobo.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/48312562777.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/42254960405.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/64294911437.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nanamog.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesevudidedigabur.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902231508_482295.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/65859656314.pdfIn PDF document text
    • https://phukienbep.net/media/files/giwigavawefiwixatisufi.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/8154785058.pdfIn PDF document text
    • https://invest.pl/userfiles/file/56240954042.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/bokoridezuxasevugamo.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/mokonikekusewogos.pdfIn PDF document text
    • https://camelcarpet.org/d/files/23740236749.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/6392700900.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/venimuradodanonakap.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wubajabi.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zumozaxo.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/xalomavekevoru.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltn4tvbpuu91654952ddc56ujm/21528687979.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/55c715e4416580e81e3060778488a205/48799362234.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/157fe64830ef2c863c591f373988f840/biweladedevofuxosimefab.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7b59ec79---viwobebuvenuweko.pdfIn PDF document text
    • https://blogsma.com/files/9988098001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=beagle+dog+groupPDF 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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 10260 bytes
SHA-256: 8ffcbfc6fb4e4f50149822c7b2fed7ed6d3f081614310ed4832d041d9a819a83
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 17264 bytes
SHA-256: cc5784cb9ea2c0624a8e85b0e4d957e1acfb8328041e675d821b2d635ae5291d