Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edfdc341b4b23b1…

MALICIOUS

PDF

82.6 KB Created: 2021-10-06 06:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 306e22325643ecd6b5785690f32bb876 SHA-1: 27f169d0aefb4b6c635e4ecdca9bb118c7137a95 SHA-256: 2edfdc341b4b23b1f39c6fa37ac016755f9048784a20d926bbd2c3fdcb105eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=technology+inventory+template+excel PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/70320098356.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/kurosateberipenewaruta.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/wemenokojuninaj.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdb19c7386---18317882246.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d886462a---56424985964.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/96926823945.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/wakaruwexawawe.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zogofetorolewis.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/gevajojedokime.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/it8gei0of106a9tac2ll1dg3tt/3241826615.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/rivusogu.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/56023194412.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/23325244858.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/kowerirenuxegapurapexire.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/nubut.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/ruwiladisi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0287af800---20789591651.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/58422335182.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/84363817199.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/nigutaxalilun.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161591e5342f3b---33333182758.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/fosesisaxarumepezo.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/23917624896.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5932d47d63c2f3af8c370afb8b335c60/kotejetudimivejapokutil.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 18668 bytes
SHA-256: eba1eb81b45a2790accc282f8e36792784f2a80751013604eb8735a227d3ac08
font_01_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 10896 bytes
SHA-256: 92ba829a7e47fd5759e0cc28aa5dbf225029b51eb0559dc5d1c85521fa38be12

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