Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df902d98aa2d949…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 07:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e23272efc9addfc706e9851d48f79f8f SHA-1: 7995e1c85a9f9bc8b3e03d60f3ed40d1be5f09db SHA-256: 9df902d98aa2d9494be8376479e98b01b10909233ddbedc526407c46d36c78af
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. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=unblock+pirate+proxy+list', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=unblock+pirate+proxy+list PDF link annotation
    • http://china-engine.net/ckfinder/userfiles/files/vixigajufazak.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/99289048030.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/kurogukewogewesinuzumum.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210913_9605DBC1840458A2.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/bufakujejajanerujolatib.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/jerakosebokufo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/40050652010.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/34206036231.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/39738274701.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258b081a4b---2375293212.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/40779957747.pdfIn PDF document text
    • http://195exim.com/datas/files/riwulebolazafubavu.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/622748673.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/15457048558.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0fd7a339---32135631630.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jepojubisafepadidaleferul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc85481fcc---kalidupezatelapoker.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136593186d04---jirarebonaxuvexodebup.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/97957013186.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/nisem.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pozujekoxajujinobenuwope.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139535f3f1da---57346788175.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/232f4e0ce74ddcb985836208fd6366dc/zajisipebuzodego.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_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 17784 bytes
SHA-256: 7e988e806e8ebc4d801ac7e32053d34a0f5a22c33a1d6ad9877e2cda3fe9a36f
font_01_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 10824 bytes
SHA-256: 3aac657cc13aa13ea70f4326d6fca8278a4594254ed4980690f71702a23bf144
font_02_sfnt_off00013f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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