Malicious PDF — malware analysis report

Static analysis result for SHA-256 5035f1849ea2f730…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 06:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 654e1a2aae87297b8f8e83ccfd3912b4 SHA-1: 7da3a1b0fc19c4ecda9447cfc3043011e153c962 SHA-256: 5035f1849ea2f730718ec449f40d53682279b43ac5b7736d64f84b7962500bad
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or 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 0.9984

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 http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413899443f2---22592755400.pdf In PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/tixig.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/96103592405.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325a5833413---83577507300.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/92119719733.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613400d40e488---36569002602.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/66657175083.pdfIn PDF document text
    • https://hoavily.com/uploads/files/degif.pdfIn PDF document text
    • http://rs-entp.com/upload/file/16376491707.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/suvaseba.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/wezejafezoxugituke.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/torovi.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/10789277199.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/79678155135.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/61882691883.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/libotagizuwewememibafuse.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/24240395065.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/26969691933.pdfIn PDF document text
    • https://termofriz.rs/files/titewumafugorasun.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/69530798252.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/56937549881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+joy+of+creation+reborn+onlinePDF 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_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 19284 bytes
SHA-256: 7674f8c20ce12b395dc437c2b258d343e38a704f4a99fb7cc789686e29b4a135
font_01_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 10612 bytes
SHA-256: b5120691685eaa177a69ce01680dfaabca3d630aa71fb466a7c5b6da4cba6d3c