Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf1c6cde3b09b76…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 08:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f67c4838277f09cd67bbc57599c2f75 SHA-1: 42b2414cd6208c2c8bf07864d0f7f15c77d650d2 SHA-256: bdf1c6cde3b09b76ce40d06cad3262998894da7f1cc5951752048f6d5cb88a13
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://smidgel.ru/uplcv?utm_term=mechanical+product+design+and+development+pdf PDF link annotation
    • http://altaprecision.com/userfiles/file/29924079943.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bd17a4967b8f2cd8f6735ac1384364bc/1088286317.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/xijajafeno.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/rabadijekamet.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/weseboriji.pdfIn PDF document text
    • https://aksusu.com/upload/files/zobamuzifa.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/8653667987.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ca43ba0f4---mubepomidakilesok.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa7625a21---rurizupejeduvomawokituvu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/56263856.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/xeposepupasojifok.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/anv6d2jad1uaa87i6s9ncplf2d/52077470241.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/zipejefejikemabo.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/dejagajijisosi.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/xiwazijojasijibukotud.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2c869ad0797b4875250b5d185610f32f/44668445845.pdfIn PDF document text
    • http://farmina.ru/uploads/files/47103090479.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622464014.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/62396595550.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/41233387797.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tevuletetevev.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/12596942071.pdfIn PDF document text
    • https://panama4d.com/contents//files/81265595268.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/gerigizifeti.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae433502414---paberijifego.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/77644039129.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/xudukukuwekigulovu.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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 16648 bytes
SHA-256: 0f48e1ccc960c067bdc947124eb1d31295b180189693cd7604b70db778a470e4
font_02_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 11224 bytes
SHA-256: b54097b1e5e0e181d35479d32498235ff9cf8a24880980e8f8573d443326755a