Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dea7a648ebf62f7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 17:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec8314ae4743618b0e4a36e7a8fe15dc SHA-1: 8635c41e1de389527eeb5f66c153f024f22cb26a SHA-256: 7dea7a648ebf62f79d137504f4a2cecd59fcc1ec01fbc022961deb86ad6642e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, and contains numerous links to potentially compromised websites. Heuristics indicate it functions as a link farm, likely to direct users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vesenu.pdf In PDF document text
    • http://seattlebestteriyaki.com/uploads/files/reviweketonijo.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/degiluwegetavis.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/nipiniga.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/xewixad.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wujakuvatizugivubilov.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/2377115964.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/fijexufapat.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/32525629430.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/lenapuxixemaxajezivuj.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/10486612788.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bcab3f0193562c74a936743c26ef2bea/53417209413.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3b746a2b---gifoge.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/pexudijejafalodoz.pdfIn PDF document text
    • http://8njl.com/userfiles/files/bavezoluseziruwuborojog.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/84087831595.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/guwekowofetidetodib.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/povorevuzobaxabiw.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/14061812161.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/21361381206.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/78990674345.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/76389725270.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae3633ca1---60298081894.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/74476rh7ke4ud9hh6pilsl9dn9/60371879320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+share+wifi+password+to+androidPDF 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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 10628 bytes
SHA-256: 9b202aae1d1ba996e4cf599e7aeca10baa34f84522e5610340095b5be1519990
font_01_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 17916 bytes
SHA-256: 703d771de2e2f3bbaa004596c62c02ce1d3c3c7b8ac6272baa7321fca33017a7
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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