Malicious PDF — malware analysis report

Static analysis result for SHA-256 1903206526b40710…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 19:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41f5c3221838a4a8656548748ce880c5 SHA-1: 4bccce8478041027810b612c0e71ed09ef149bb8 SHA-256: 1903206526b407108f83c0a17760d9485e64796478a91abd444d2694e25a32f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=the+wanted+strictly PDF link annotation
    • http://ildungrice.com/fileupload/fckeditor/file/vamagitifidatawepep.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160770bffc014d---juketojunumet.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823910353ec---70996562088.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160878597753b8---rewowumunedofusipasiper.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b706ee1de---42905053426.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-5/20210605215135138597.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/75117403763.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/87481926149.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607140d86c51c---jetanijomoxusaxomuvumekow.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/61686997169.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083262490496---wuwub.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ap159iidbrn3upnqkm992t10q3/mowijefudadotojafes.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9275f108a0---puxuvoxuzaju.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/giwajit.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb12f24b6---37810203316.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9emncob5ooqqr85clurov8tal6/71291089499.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zegigejisanulolav.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/moxijeweber.pdfIn PDF document text
    • http://tele-video.ru/upload/files/43222812372.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c84300c9fe5592a6dbb748b2c91d85e3/38350316267.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959898cc34---717204085.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb137cf7b---pawuwuw.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/eb957ffde7efe39502f26f6836f6dd04/57590695317.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/30658436853.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_off0000e901.bin
5502e9e7c3a436f817b8cb23202006d67d18d5aba007dbab4c2a5d77bf4e855c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 18012 bytes
font_01_sfnt_off00011856.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 16792 bytes
font_02_sfnt_off0001306d.bin
63ae6fb623fd343028b352fab27efde52cb719b746f36faf663dcc3de6be28b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 10512 bytes

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