Malicious PDF — malware analysis report

Static analysis result for SHA-256 def030a1ee378c00…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 14:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2141c363892f421e788ce83e847221bb SHA-1: a2671594aec2e74c9cdd309ea4e1b7e7d2717a35 SHA-256: def030a1ee378c00c4912090d0a6efe7d31f67b697f58c43bd67880881b6d111
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noelex22.org/userfiles/file/momifenaveminiv.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609215a008542---zepudutavugesozazimiwuxos.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/36204343929.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bilonev.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e358e3b9c7---1786036140.pdfIn PDF document text
    • http://toroisg.com/public/images/files/fasefadiga.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c12472db0c5---rajesiroweg.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98384666378.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be465bd3128---kisamifolek.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dojozeneliba.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fdba7d1eba31fce7597b531ddda6c1bd/ladepusijabupetazos.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/zosodofoxeneforezat.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdd2642f86adce1d50074ec4847f63ec/54641281795.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/midemipexiniput.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/29293235220.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/26199345015.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/topofetikamojumirowiti.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/85518528736.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sugexefivemusur.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/wezizidivuru.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5323e612---30004029727.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d3983db---kalaraweleviragamodirif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+a+fast+horse+in+minecraftPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/07df840106bfe6c3b2c8d007459ebd18/sedojedidusabukaxuzirese.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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 17332 bytes
SHA-256: c04a8a62916881c784f3c1629a5f82d548aed48b088c2bd215c4daa0a4368b9c
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 10812 bytes
SHA-256: f8147b6c2bb3c5307ad4db2615af26a9abeff501136de1d62dc4c60239fba83d