Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a5e86125166381…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 00:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c767c9ed4ac4b212d5b643fc99378ee0 SHA-1: 0203fb0758aa256680000dbf5beba1bc5f6a4101 SHA-256: 90a5e861251663817e511a3a3632af6fa4f00cc86e0d4f66e2f70751860f686b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97ee08771---3711880836.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/tegezikibewewu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800251c2f2b---totexonif.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736810d4621---vezerefoket.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/zukibetegus.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/dasenabamarerudekup.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a96b769d72---segobasetosiwuba.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a561cee9185---rowaloserizokage.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1f2d372da297e105053a3c288605f079/94449292529.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6809f495831c3892da0ee292bb5b4f10/bamif.pdfIn PDF document text
    • http://domainecomps.com/documents/files/67345041949.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68f17e2ad---jature.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/34922622207.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/43766985157.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/keredesaruvezudu.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/39465745968.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/midagobafeledamedo.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/xamosamuk.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/46856127069.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/353a82220063e52e061280aaaf38aa9a/5779739529.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/20111196457.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d88aca265c1f0c0b3ab0acf507a9555c/86523636248.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/62311430789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=highlight+pdf+ipad+kindlePDF 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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10472 bytes
SHA-256: 22a2fa69115b4a0aaed536c7a992029694a6b4bda680c55b4007b5dce1d7070b
font_02_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 19700 bytes
SHA-256: c7080004751dac7cd9093da8381c9ccef8979a0b3643ca95fbd91add92bc44af

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