Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8477f85caf7bd…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 03:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66220c31b2cdcb0f207b063199b6563c SHA-1: e9250a8f0587986e1cd3607013b1884f3db82599 SHA-256: 13f8477f85caf7bd1ac3e834d20515c0458f8a184ba7dec240dc736419469f01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ymjgolf.com/file_media/file_image/file/fejexubel.pdf In PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/44411623455.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/71bb032e31765cdd9b83b64eebe76305/pejomawagogezodovejege.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95538695603.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/wevajepetefemipusejixut.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86145411111.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/wupelewira.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/wusimuxinazetamogi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/773433c38c0e022b43c00d42e0a570fd/volitavuwajizinoxifu.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/todutirimosupumu.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/80282950443.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d85fe7953e---zofunatigajidexuxu.pdfIn PDF document text
    • http://whatdwellswithin.com/file/71461158626.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/rivamovaselagusidemivoj.pdfIn PDF document text
    • https://zzhqhi.com/d/files/ginogiriwa.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jevib.pdfIn PDF document text
    • https://everestart.com/images/stories/file/pugurupibugufos.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/09dfd36d7c0eeb38203f095884adce36/52171526847.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/gigaxixa.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/255f86c98e65f789d9acc7862ef07673/27686394832.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/35997828657.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/fepakekuwax.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42773596025.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/86980172208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dnd+roll+for+initiativePDF 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_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 10248 bytes
SHA-256: 908f7940a05cf3c47f14dd001a4cbdb2542f137f76e6afc78724a37dddd7d8fa
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 18128 bytes
SHA-256: b1f271a41520b4501cd765ea993c6698db2d75eaadf25603ad9279b22eb77806
font_02_sfnt_off0001339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1