Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac773e93a7fd12e2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 20:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6673fba98d3979d9b6f745081458792 SHA-1: 002a3552865978c84de628267854efb35b105c92 SHA-256: ac773e93a7fd12e20d827e297b429a56eee268a3bf1b8f2bc24be8b7508c2b7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clair-environnement.eu/catalogue_dynamique/file/54419420904.pdf In PDF document text
    • https://leresto-niort.fr/images/userfiles/files/97898759411.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/funubipujugojunas.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/36907199749.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/sutetuzifuw.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xogetuwawedabevadi.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210904230233.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/pudegonunomazogakef.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/54726810510.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/20046333381.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904025716.pdfIn PDF document text
    • http://pileki.com/imgup/file/84653716663.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501ea85853---77325768089.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/13233605440.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be7c30987---54273399059.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210907_014DB4A3E9FFF0F5.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xemewofiraruposugaviled.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/95337719725.pdfIn PDF document text
    • http://iwort.de/userfiles/file/94657251168.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_47BCBEF79995C6CC.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/provkspnprdcohe1n3ackn8mq1/loraz.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac5cbd426---41955959931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=einfach+schreiben+b2+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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 20596 bytes
SHA-256: 6dda660952779177a361aa44eb8752e87615de28e9c6ba30f09ed94bc80399b6
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10696 bytes
SHA-256: ce256864698b8e79123d782e1729804292a6505b71996bd3d7f6e8816f35036a