Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae74d53833b87bda…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 12:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d788ffde76067cff5c1eeaadf33b4b43 SHA-1: ec2466f89db3a532a4a089ae24f0975439b8fc55 SHA-256: ae74d53833b87bda5e2b56bba20e4656b24360b56db5444b49aa0a9abfef474d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=trilithic+seeker+manual PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e3e4722ee94516cb55a9d9720acefe5d/16138704659.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123685d03bdb---zewof.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb59fca7f4---lukujixotuvapi.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14127011182.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c5ed7bbab29664f5ba38e0cda94f0631/15242247242.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/199623543860bf82ad04e41.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lukudesifasugewuwofilupi.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/rilolukomij.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/69072807029.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/64973158231.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b13a16359---6467381533.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/nariluk.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2ffa88c30dd670b96f98477bdd21cbc9/lukokarifezejuloxiraj.pdfIn PDF document text
    • http://centrons.com/uploaded/file/197790678560f72ff830de6.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/30759561511.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/aa6qgo3l359tgpoksb71a9nr45/zasogaba.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir1us4pcsd4ps58evureh8s587/golekubukib.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kql9oq741q0eirhjme0i2tnm53/junazade.pdfIn PDF document text
    • https://partnermind.cz/images/files/81147433491.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/sibuworukukodadu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mubujodixijufikuraxuf.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/51530195207.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/96948758135.pdfIn PDF document text
    • 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 17292 bytes
SHA-256: d6ca20c1dffb889dd52904a3a5716c9e5c1b9642df8dc0feef47edc5b4298c98
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10532 bytes
SHA-256: 19c890113885777f0bc6c474069c53e348b30a03f8b84508d5ce70e3a2c71b26
font_02_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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