Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df69b6be33297c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 15:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c99232b6f16016b1f57026110cee2433 SHA-1: 239890853412aaa28d2126db1ab3547a05d485e9 SHA-256: 85df69b6be33297c7562eeb304dcd4e5993e16954dd51526038618dda95cab87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various hosting services, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs suggest an attempt to distribute malicious content or phish for information. ClamAV detection and ML classification further support its malicious nature, indicating it likely serves as a lure for downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=download+picsart+no+watermark PDF link annotation
    • http://mdtrend.hu/files/file/91166284353.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301936958d.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fe089aacf1951b1cc53e6d1ba26c7a6d/97625571102.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/perotufavodoxe.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/fakoxovubuw.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/vumufefarigixurijotenap.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090917041311.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57980000483.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/51668241206.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/89067802478.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zajigopelarovamamulewulak.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/53146007338.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/24025191962.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/12231050350.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/dirarujiviredukilujofoku.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/25268156699.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/23437812214.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/54919041490.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/toxoxemexiwojitos.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9912a8b4---wofuvivisido.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/mepozivelugusutogiso.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/58065781234.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/83498027478.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916210925.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/76540256718.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_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 10856 bytes
SHA-256: dd4acad36deb2c15910e1a8786f9c0c68687421689842baaaa480365cac9ebb6
font_02_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 15424 bytes
SHA-256: b9b0d134d02613f2cfbc69729b68e1314304cccae293ebdae0f1af0fecaae505

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