Malicious PDF — malware analysis report

Static analysis result for SHA-256 7512011ab22628ae…

MALICIOUS

PDF

87.1 KB Created: 2021-09-11 05:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f926f05889a19e5bb89c2ecdd2060a9c SHA-1: 4ffeb072ae4878465cf7b0901f88c02fc0cb1305 SHA-256: 7512011ab22628aed512929d540bf99ce7fd280c1bafab503f58d6756f53631c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, limiting the ability to determine a more specific attack pattern or family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://gencatakan.com/upload/file/manuxarojujisutusizobef.pdf In PDF document text
    • http://sromedical.com/file_media/file_image/file/gisaletut.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/65634071014.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43049389841.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15516787d---47288126969.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/ragikepiludi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/gobesiku.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/navovuxibegogodonirumadag.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/ruvafevegi.pdfIn PDF document text
    • http://pjteam.hu/uploads/98604548510.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/8802835647.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/xinotetep.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/bajopurasadiwadimadorav.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7e631003---52749459567.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/67915651713.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tisozeteduxipezoboret.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/72390591242.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/valino.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/71234097968.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613855d6d122f---zufavugejowotizam.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe23d063a---22929304333.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f1a4a27b---23246093321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+cool+things+to+makePDF link annotation
    • 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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10868 bytes
SHA-256: 2dbc792e9bd92a4d0633810c98d2056720ac75e10b16d3bd70332153d2b24795
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 17416 bytes
SHA-256: e043257f4d4ba121acc3819c31d495bfc7382d9b6b6e5af0e83093d786cc02af
font_02_sfnt_off0001367d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1