Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4dc97d74d6daf0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 19:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 184e67131e129d21697ef13e90f084c1 SHA-1: 5e8a869438b93c89503bf37dc2066c5ef10cc902 SHA-256: 1c4dc97d74d6daf082bcddb9c294f6ffdcca24428d0e6b857c249903e34d1017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on disposable domains or compromised sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://doktor-okonski.pl/uploadimg/file/xupobijerebogikudareweru.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7dd0520ab51cb5e308671cf17bc6cb1b/buwovaferoxokab.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/voterizamuzibedol.pdf
    • http://miskolciharsona.hu/pictures/file/94540647717.pdf
    • http://technology-mp.it/userfiles/files/boxasezemibuwo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dbbc4b292b75d08d8cb9f5e19c304783/bidevogosodakeraluwi.pdf
    • http://robedecreateur.com/img/files/19377615717.pdf
    • http://homokkepek.hu/editor_up/vozuginitojuvutuf.pdf
    • http://planbmedia.hu/files/56263520927.pdf
    • http://nordicwalkingturak.hu/_user/file/vekotodemigidepisudoruta.pdf
    • https://literie-depot.fr/UserFiles/file/tobopabederofufa.pdf
    • https://zegaoyun.com/calisma2/files/uploads/27906791056.pdf
    • http://chromoink.com/updates/file/palomibizel.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/16938337511.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/51455360629.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9f96ea398960ab740d950e345b0f8470/8060355127.pdf
    • https://garnet-medical.com/userfiles/files/94624278970.pdf
    • http://alarcon-v.com/editor_upload_image/file/rorijerif.pdf
    • https://datatech-int.com/userfiles/file/lefofizaluvapapanejeb.pdf
    • http://vizugy.hu/uploads/files/zofiwotisom.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/nifolakovero.pdf
    • http://fanta-life.com/userfiles/file/givuwogetujopupaf.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/15651464395.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+i+can+reset+my+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000add8.bin
bc56eb26d815f92cf84308c379c04fbe354070b7e226efdc1b922b2a1140839d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD8 15272 bytes
font_01_sfnt_off0000d470.bin
71a0809fafaea454fa96979270fe09e5ed1248d20b88168dd2c4081817311295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 10784 bytes
font_02_sfnt_off0000ed29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16792 bytes

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