Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75547ce67082860…

MALICIOUS

PDF

84.8 KB Created: 2021-10-14 05:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1ba8a858d95bc4cad3a43f293a927aa SHA-1: 410e84044c3f36b903d0c42fb9879d37f3bb941d SHA-256: e75547ce670828604b3b911cdbd6db2c55b043e0553dfab98b60984e7bff6be9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting an attempt to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://julianina.de/upload/file/jumevitepavudunifetifipu.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162ae51bed74---40385648950.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/48932114800.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/tipogenu.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35074237804.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904030642119797.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/fifuxuguvi.pdfIn PDF document text
    • http://wuchem.com/upload/files/gidatiseginutoxepojafe.pdfIn PDF document text
    • http://goodmax.ru/i/files/4748481474.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/dolewolabup.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/72038855730.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21421a97f---zojag.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/26500515432.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20211001134353_9scggn.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/xunigifijodavovukodawolav.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/dupofefunivimel.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/zodeseroloduwagonirok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a47ec3e696---dumuxotu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xixukopumizumono.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/27532108055.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/kanamevelavomifipoker.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/47703574416.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/gojidukotovupuvadi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/guvufixelas.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/wogubatim.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=the+very+hungry+caterpillar+japanese+pdfPDF link annotation
    • 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 19036 bytes
SHA-256: 2d44e1a7b1d4b6f66537727b0e997ed5102a2d32c522bc490be3c3ba3a583b34
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 11152 bytes
SHA-256: cf5e42e432bc80ccb7c0064ac0b3e14c1b66d9212ebf0adb1f40fe18ab1390e8
font_02_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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