Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b33dba86460f240…

MALICIOUS

PDF

76.5 KB Created: 2021-07-01 00:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 03d98f905f1b36887301756ded8529a3 SHA-1: c235dcddd2f85cf5a6de985d3c112c918593d39f SHA-256: 3b33dba86460f240d645058beca4c3a4bf803d232ecf9f8a3dd456e895017c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised websites. The PDF contains numerous external URIs, suggesting it's designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=calm+meaning+in+marathi PDF link annotation
    • https://novamakine.com/upload/ckfinder/files/pepixafusubedumin.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/68642900623.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b12e31abafd---totevebusex.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11fda6654---womevaxuvaradajunipewe.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b824072---sesitulol.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160831893a8560---7629956721.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/xevavumojoriko.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/68933458143.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/e5a493e7il8jng9c0se9tf2lr1/wopunanezivixus.pdfIn PDF document text
    • http://grupophi.es/uploads/files/nifowodilojasuno.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/56693468852.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/gebapipajujoredewobaxala.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/tusuvalamexegofigumatuno.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e8a18a4fd---92721011968.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/79265880123.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f275e43f2---26134123598.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/jarukodobera.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/91363853963.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4433ee0a---bezobezozodegu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/63ac4ec7f9b9a011c26eca9b4e5a6d49/13863799714.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a71690ba---zevisumekipu.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/jikofakexizodimeg.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_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 18188 bytes
SHA-256: e4e08baa43350ce9ddb7385ae5447e149849eee1b6d05a611660c9d712c61dc6
font_01_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 10296 bytes
SHA-256: 78b83f538f9046d51da55641dfd357fa307b2e8b923782f85ea506e196b58bd4
font_02_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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