Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b70a4a229bbb1ef…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 11:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3ac4fa8f13dc579bfe82d8088e81520 SHA-1: 3f3d7a161ba4ae55c636d32b71d97489545d6806 SHA-256: 9b70a4a229bbb1ef78a1bdfcfbfdd739b5306f13c37733267ee0b582566a5daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://mclandpin.com/calisma2/files/uploads/28938408205.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909475711dd---xugukezovutote.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/caf416baba6435a6c914adaa2fd68c7c/37421647086.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nanatavitifefe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da88fc13cb4---89190149963.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/ziganojos.pdfIn PDF document text
    • http://asid.rw/userfiles/file/muzak.pdfIn PDF document text
    • http://hexindechem.com/upload/files/nexudesobovufapifigo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/kagobozutulurilevivigugip.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/xugidigutaripezubeba.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/339177587549cc3e4a6a94b984b2a692/80742650185.pdfIn PDF document text
    • http://torgoborud.org/images/file/mimisusad.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/folimere.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/jaladepixijud.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/famesuwurexewepoveragusiw.pdfIn PDF document text
    • http://dhf-china.com/d/files/pifufuwuwowedanabobe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbe2cf378b---xixexiv.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94045b313a---91278900884.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/37700018695.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rosojuspbolenr53046lh0dquo/97383455973.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/5597605046.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/gawuxenap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=isomerase+adalah+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_off0000be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 17520 bytes
SHA-256: 03f245d7af374f96ef25d29ff39f3094cd7860a933726f5ca92722f2c8adcbe2
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10420 bytes
SHA-256: cfc23f25e71dac8d8d9209152660ac99c2362b84b95b6fe805a86b71116620ec
font_02_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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