Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39ea365d9eba012…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 08:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b5c1d6f3bb2f6e8d6400863cb5e809f SHA-1: 34f05086e44cc5cff87dd606bcdc2852ca4f45af SHA-256: e39ea365d9eba0123a89b9a3f4e97a12142b01960dc8989e49e99e2b10b57855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=feliz+navidad+easy+piano+pdf PDF link annotation
    • http://franzoesischebulldoggen.eu/userfiles/file/61443038990.pdfIn PDF document text
    • http://www.andreapondika.cz/file/35721545943.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe5a6c17a---budukipupejiwulexigazakeg.pdfIn PDF document text
    • http://saydersan.com/firma/files/60508628634.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/42204589160.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/10591441269.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vifolibivoma.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e430f9c6---dugotakap.pdfIn PDF document text
    • http://cycling-software.com/files/file/1532294894.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/55726982476.pdfIn PDF document text
    • https://www.confirmedtour.com/files/37991026200.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/70420175753.pdfIn PDF document text
    • https://reniuved.it/file/gasojaxizomixofazifidiva.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/weguruge.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391e1adb949---12745226738.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/23786486331.pdfIn PDF document text
    • http://strandedtattoo.net/file/15641080151.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87206854618.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/27092505744.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/terabanogirefokeli.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lelajilobukusarebe.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zizetasibalusugexuga.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/zedazugu.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/65749657640.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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 21340 bytes
SHA-256: fe93d7c68701a352bc2be757de1b3bed2dbfbed9613c7a1aa7cd66909cb5a6c2
font_01_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 10512 bytes
SHA-256: 186739c51451bc903928038b7185e01c4574e52ece535bde70554ebce031aeff

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