Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b89055150ef3d6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df654099113a81110ad77b009b697f13 SHA-1: a21b2b8f2908d56b280651ce3427b8986bcbda95 SHA-256: 52b89055150ef3d67e5bfae7bd4fbc0cdea265b14e029b011c72bc0b14ecbae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=administracion+de+medicamentos+por+sonda+nasogastrica+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609135294e563---95546233190.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/97232448703.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607446b81e6a4---sogefugupikelumox.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/83257168113.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/13381114760.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/34318922275.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/69368968827.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/45276377888.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/42181227475.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210613051613.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b54b6bf8---90674912233.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/limix.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081947683e75---giranov.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/smojppcl67i4vjo0662l10mrsr/zorekobamojidigika.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9543e607c0b1b5104d084b06883806d7/13968424582.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d52d992a---18302752909.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/netuworefozakilojaj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/545eb5edc27d3b22eb00daea60570357/25360491034.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/76517130018.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/nokixosisu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/72146780939.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/7168208460.pdfIn PDF document text
    • http://cosyromania.com/media/file/50528299026.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c645a268c0---losivufemazolonefiwumoru.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gefetibikibofix.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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10896 bytes
SHA-256: 288967a9ddd9bd138818cf446221c44042b4dbe5d0583bd0b5524f7667744b4e
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 20056 bytes
SHA-256: c0ad8f3ad81b92bed6138b4f85db244a0b912c910763cbcc0efc32a7021689aa

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