Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1ac4a1ff400a1b…

MALICIOUS

PDF

122.6 KB Created: 2021-09-04 13:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 625d127970eb0f8d3102004073e5018f SHA-1: 6c0ce545cfffaf00aad81b958766c365bcb5d019 SHA-256: fc1ac4a1ff400a1b3d1c1bb9f575ff7f455c582c4c2984a63b48de074d4b8187
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, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URI heuristics further supports this, as the PDF likely directs users to malicious external sites.

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 https://northcoteplaza.com/userfiles/file/64629140533.pdf In PDF document text
    • http://qytbearing.com/upfile/file/60744109050.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb1081c91---tibujopegikakowovolado.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/33568470518.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4bc0a09d727934c5e146d1dcc3f52bc0/legamej.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781366cc995---burefetivirux.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d435794794---gotibazufejinima.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/868a646db52ca14fc6a4f4e343ca2751/50983436111.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b91857266ec---nitowulojokorunojiwat.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/6583667705.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/96886187858.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/zolevakefexulematogugoval.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f18713da6---xozazigonubu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/121dea8a800227459c2d09d8557d1b45/30304263153.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1nl1m3hhuvug8j5vhtn84uf4d1/xugikusezosoguxamukeg.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf1f3768b---78843074109.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/24e508b4947244f4f93f47903709cb84/sopakasuk.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/75391527095.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/87391402391.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nulokagagegurorozidiw.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/92754767148.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4jc4ib8lou2ol2egi3b84idph6/wabexinalikaniterigikajan.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/wodevuxowufofudoloz.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/lipozagoviwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kymco+agility+50+service+repair+manualPDF 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_off00017946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17946 11244 bytes
SHA-256: 358b87dcfae7bce213daade6371c395096e2dc79bd50f9da30d59cd61cc6b853
font_01_sfnt_off000193b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193B7 18896 bytes
SHA-256: 8265632fb967410129dbfd5e5523377dd30db316a8017d79c626704b8743ebcd
font_02_sfnt_off0001c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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