Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6e4b41b4ec3b54…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 12:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e1410c21660be4fce5b6023f3009dc2 SHA-1: dc1eacbcd4bb0a34134087102e183e27c4316eaf SHA-256: cf6e4b41b4ec3b5464772cd2919fd1ec3543326590d8e4ed3e9c7f4cb20973c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the overall structure and URL patterns are consistent with a phishing lure designed to trick users into downloading unwanted software or further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=download+popcap+games+collection+full PDF link annotation
    • http://prvugkh.ru/uploads/files/dotajo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/2q8qh7b968qpfe4i8hcjhoj7p0/romazagazevawakinifemora.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe015d270d---71659678806.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8aa159e2c7b6863a66c5878268a515dd/vawiz.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/bazibirat.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130733757e47---kenopomak.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/kitemefekefilasogirixo.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/rivesesikidejirumef.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qkrh8ea8379ljan138m56dohp5/29473718558.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/zomelabokidesuxolaliv.pdfIn PDF document text
    • http://roocenter.ru/upload/file/12348553336.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/nakojotojetotewalinuzelu.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/71969769881.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/66146694661.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_085206.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109131111034661.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/96174494073.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/26597382790.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/38697840789.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf30eefb9---xusomusifejukuz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131af97dde70---zafekirapune.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/derukamodi.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109070031127862.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6df1c15c6cde7c5c4c102b5f5c8a1957/8427444419.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/86025191100.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 18432 bytes
SHA-256: db1207a14b2d990142f98c8e9656b9c17d69874fb22995adb3ea0a54411fa57b
font_02_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 11048 bytes
SHA-256: 81203de4d44f55da04d8015f1987bf5acdfdf4706bd24d6e3c53226fadb8381e

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