Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e96e9bac44c79c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 18:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c0e815d7a683b27788a4beff87dd0c1 SHA-1: a51cef32dd35beae2c214af9b90b0baa6589cc3f SHA-256: 96e96e9bac44c79ccea8610bad599815ea5f624c16cff5905a2a0ffae789bc6d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e9394e0df1b99810aab49080e7f88d58/mipajawipile.pdf In PDF document text
    • http://el-master.ru/userfiles/file/rosasotenuwo.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/43279897011.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868ad83081---bitijusokerezididobi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/59686123596.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/demivo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/550c423bef075481beb6e2a1325af914/37546184757.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/winarime.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/bokurusivow.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/rofosotemunolot.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cd45ec15b---gunofezokat.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/pajepugogu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4886be7683834fcf5d850780ee244a3c/74713486549.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/k4tspu56j72mit0chct7i3f5mt/wipuzi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c52fda561e4---pigalulibivan.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbd98cc29cc0ae66148e8d559c71e5a8/zajororarem.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4af13d193278135e709a300ff89c932/97829556836.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/dijutixatozanadisapuvur.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/juzabebinotiwisaleguvi.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/32745434672.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/56074509633.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/texakesejifebubibezuj.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8eca3245---10372298804.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nudebep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=onam+pattukal+malayalam+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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 10380 bytes
SHA-256: dbb238b49dfb416134ea98af9a3a88ec04f9732f3272b2a4658c20825a9c7887
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 16752 bytes
SHA-256: d99dc9abd6ca2c4d643a76843e33d2dc5f5575eb1f6bb2aa6075861dc03be5f3
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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