Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18950298dcc1a55…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 18:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ecb3767ed28e078cef2b9374064ea00 SHA-1: ac893baa19d86ec06289baee9820e19cc6ec3920 SHA-256: d18950298dcc1a55198cf77c897e8c6fc98effce80385cca01bd562c01693b1e
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable, suggesting a link farm or SEO spamming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=roulette+online+android PDF link annotation
    • http://musicfriend.vn/public/default/ckeditor/files/gilobupisa.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wifizaxataweso.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b3400ec44a2d18b6e7aef662232ac3ce/83986438392.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/dalariximipaserizokiz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161376ab4b5cd4---fenav.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/29901470037.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/5983112068.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/jurogonelut.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/tipitivivexulezubuxad.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/86970724953.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a11b5c36035de787db99abbd6ee12a2d/94159931104.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/beferikawivas.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/48727029421.pdfIn PDF document text
    • http://ndt-ultratech.com/files/11295431628.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c0f8cf9a103d108ed924a8adddef2de2/43931614822.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/1880358816.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/wusaxujubepuvidubojugap.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/rufitubiwisis.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_36A6A5D2A1276852.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/fupizifedafi.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/jakorifewisafotaki.pdfIn PDF document text
    • http://pololanna.com/user_img/files/11069982839.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210911011744.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_off0000bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 10216 bytes
SHA-256: 0764c82511c432d737e9713322599da10787ebf4e0667c0e0ca607e8e5c07ca5
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16468 bytes
SHA-256: 984fe93231d9316c873282a378811296b095468a0d71b2fafd5f23794d11c9ec

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