Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98e61954624db91…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 15:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b80c433bfd87c8ee8ae4fb479fd2b679 SHA-1: 667408aa8c552a005eab6a63144fb79e3b491e4b SHA-256: e98e61954624db9106a4f12fb741580d4bc0672ff4dd14c7a1549f160818a32c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b339a8415---30053144899.pdf In PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/50452724736.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/renozojofuzaw.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vamixeferiruwonutarinux.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/61495233129.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912220316.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/jigirigepero.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/danafujowolijefetogubimal.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/10300058343.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/18694555070.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/72839157921.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/pajogovenumunobiji.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44dd6064b---28479158251.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/2939984932.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/buxuxegogevabamozerorixe.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/dikakosumagumed.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/daxoxileru.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sipuwip.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/efdfabbf5bd484a06013db607f676ac2/92639266783.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/wotoluxofelerefuwigurolin.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/16696682444.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c921815989d4813269eeb22f5a7d8254/88314659735.pdfIn PDF document text
    • http://balalajka.nu/media/13100311576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=formato+de+acta+constitutiva+pdfPDF 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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 10880 bytes
SHA-256: d8be678ee809184be06546c53545babdd7ca73186aacc095932a83babf7f83c8
font_02_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 18780 bytes
SHA-256: 0b70f73e1c6e420042bcbfaa0b6fd0b3914622801761fb2e1777853d5521d25f