Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80e26516c6c3e50…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 06:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b26bb837e077a4f715a36c4a2f52b6ec SHA-1: 01bcf7bce216c1f9a695e119603435bf1e772439 SHA-256: f80e26516c6c3e50d2954854fd9a8568323f0cce8521fa27add7459735cde0a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=minecraft+creative+free+online PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b14676c501a5c96d35c260ba3cce2f8f/30028398521.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/depuwowome.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210905221424.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e88c20e8a---18487950051.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/tizevabubif.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/98970881622.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/55658253734.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31366471510.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210920_C45907E049BA77E7.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/guvodawutupazuvakovip.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/45980365792.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/levidozonodozidoje.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/pulowejujasokirekijimof.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109022316558822.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/48946225419.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210920_F7EEE9FDCB49BB64.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/24293073376.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/41456989425.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/dujusimarovusibusanisu.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/91446667787.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ebb351af84192f1ec3b625a0955ce7c/18965684265.pdfIn PDF document text
    • https://kokomanis.com/contents/files/83486728628.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kexezuloxamubobo.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/67957321607.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_off0000b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 15808 bytes
SHA-256: 65cea108334854fbd19f9ad59241d18dae7a32129aff46d3098f889a35fc4041
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10220 bytes
SHA-256: 6261e0a57ed4567820be1468cfbcfe5403afed84e891be6952cf6dbe7a16a9ab
font_02_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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