Malicious PDF — malware analysis report

Static analysis result for SHA-256 626afecfb3829488…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c871854903b0c6d0cecc816c7469d085 SHA-1: 76804c20782227032091795f9cb4ffdfec541cc5 SHA-256: 626afecfb38294883dfbe83deeb50424fb1276401d64e679253dc752940ea2e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this, indicating the PDF is used to distribute links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=sniper+arena+pvp+mod+apk PDF link annotation
    • https://rireenfrance.com/images/upload/files/zawubotowedemunoxitibi.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lenamosixumija.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613943f2f02e4---mavanov.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/reziwukuwefezekanufe.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/23610215950.pdfIn PDF document text
    • http://clerus.hu/files/file/mazipibotakavunuteguvino.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/55621003612.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140322506ab7---46334863964.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/xetevibiminado.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wunikiwusubufazenibe.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/87444141364.pdfIn PDF document text
    • http://erex.hu/upload/file/40712089314.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/23362850715.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/lesukakevimak.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b104469684b56dbc35a64632441e7464/54719611127.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/josizozerejeravud.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/40101212156.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/pizasufupisonatamowusu.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/vifumimijuvitivabutonutag.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/14003028026.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/93429960946.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/67901573477.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/2694638251.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/25794802687.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/88777194165.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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 17932 bytes
SHA-256: f939668d3a09c1190f4f57745827cf2318dbd37daf13c90c3392f8d88c6c10e9
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10476 bytes
SHA-256: aa842a4bddac52d2c11e19d8bd15f789b61accc8a7366b4edc813bc903b18c90
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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