Malicious PDF — malware analysis report

Static analysis result for SHA-256 d322508665483aea…

MALICIOUS

PDF

91.1 KB Created: 2021-07-18 16:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80235091fdae27e31b473f832508798b SHA-1: 97f7d34bd3aae1c05fb3e68fb47e828e818fded2 SHA-256: d322508665483aeaffde7fd5c70fe44103929f84a1ca2b8ca1719bbc7f148068
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e02f1d9bf---88991941540.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16074f761a89c0---38053579343.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/tusejukavemifatodalifonan.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ed7aa17d---68618845399.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///timoreba.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/fafazisuwadabokidi.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/44827993259.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/90932384933.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/16020266869.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/delajeruto.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/62984470476.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/43874843278.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/xafipudimakalesozomopo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078526510962---84350527138.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/paraviwuwifajubat.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5fd3d579eb6c30b03c20d0b003cba8a8/51216762004.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083f007aa4fb---mufowipumew.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607175f85132f---40463942153.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wolatapinafuv.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/71368917364.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/40435337159.pdfIn PDF document text
    • http://freeski.hu/freeski/file/gitipu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5d2e410f1dd77940cbda1d0c028577fe/xorusewiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=entropy+in+simple+wordsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8208c812ab49bf6a16aac553c3bf6259/zazawubisodelimok.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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 17428 bytes
SHA-256: 4df34fb3cdc79f2a64a29a432952d03364bd00fb103fdf06b02c08f2ff11c0f6
font_01_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 10576 bytes
SHA-256: bc7f9256f7fbdc3c4d712603d8ace00a70d228758f4fa714d6db1ec69a6cba9c
font_02_sfnt_off00014710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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