Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ba45e838caa074…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 13:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 665e185b22b91a050d77f93bc0a14853 SHA-1: 0601a82300d9e5f656c5a62b6aac78f0ebd68216 SHA-256: 49ba45e838caa0743c80f53dd44b35f76edc551f61a993f13e960078c3455cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of a high-confidence ML classifier firing and ClamAV detection further supports its malicious nature. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=notepad+apk+for+windows+10', suggest a lure for users searching for specific software, likely leading to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=notepad+apk+for+windows+10 PDF link annotation
    • http://hkalc.com/userfiles/45615118131.pdfIn PDF document text
    • http://strandedtattoo.info/file/depovud.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/nulamomokujupujasegito.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/58smkvmvst90mqrlfr1ffbesrl/zazulowe.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/refasuwag.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/buxez.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/79817279168.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908022625739964.pdfIn PDF document text
    • https://0900107678.com/upload/file/33854821511.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6fe7dd0e339492d72bca96bb36f388c0/lopetasunuwodazako.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/vamipaloboreb.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/69087936376.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133525dacd59---75970413225.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/91030225854.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/40070172533.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/39339654571.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/81469970391.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/92763412837.pdfIn PDF document text
    • http://nprofit.hk/userfiles/40139772449.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/909a78395ae546fd8e96a436854a0767/dezajedisakoreravad.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/podovegerowo.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/kukalawazanezegefenokoxu.pdfIn PDF document text
    • https://robertbah.si/files/file/87417822419.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 17656 bytes
SHA-256: b8a31c03a7f73f77d61ec656f08a5e995aa33ae96e4f1cae198b0b8b0be9dff8
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 10776 bytes
SHA-256: ee52dd00cb3b71133e2314dd392c20adfcb3ccbe6f6cb975e0feee6a95fa1279
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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