Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd1381d0b7dd1b6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-24 05:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cfb8e7f65a8a1fb1b11ca22781fa393 SHA-1: 0c11273eea5a2b2a031162f1e951ddade809d173 SHA-256: 5dd1381d0b7dd1b6c5437845b1086638de99064c7c167c7419fb6628d5963262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=my+cafe+mod+apk+unlimited+coins+and+diamonds
    • http://iberryhomemade.com/userfiles/files/81308468990.pdf
    • http://deltools.com/userfiles/file/56520671887.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0efbe51cc---wakuzafaxiduvizukevinito.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/21319954998.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348f1d9740b---jasalogev.pdf
    • https://evergreencans.com/userfiles/file/tixarumara.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/gajutis.pdf
    • http://kdbelektrotechniek.nl/uploads/file/30528839836.pdf
    • http://veszpremlizards.hu/_user/file/rotugorigawozem.pdf
    • https://jungleflightchiangmai.com/Uploads/files/rivosilovojelafusuluduj.pdf
    • http://sunrui-ti.com/d/files/rinekegemif.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf1451912---pobunudiledogorokazelode.pdf
    • https://ermolino.mebel18.com/uploads/files/wepumemukexebisogirul.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eba197fbf681249600e13eb3ac5d6106/buzuk.pdf
    • https://girl0229960192.com/upload/users/files/81515528755.pdf
    • http://potya.com/ravowurexizew.pdf
    • http://airmon.hu/images/files/54536151277.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/50550690006.pdf
    • http://bodegaadrover.com/userfiles/imagenes/kinapolisojikeroja.pdf
    • http://prime-standard.com/piceditor/file/25778284642.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bepivixoluf.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jiwog.pdf
    • https://tannhatviet.vn/upload/files/19611921257.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613449ba91bf8---kasesiwutapolojomanilidu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db49.bin
0faa40e1891e0eecc0368ab548dcfee044c4b3df6f485c91dff7a383308b247b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 19384 bytes
font_01_sfnt_off00010e2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 16792 bytes
font_02_sfnt_off00012645.bin
d2a999b5f04a094aa0533a6b613a8b4f49b9851bc20ad09acedd54252df6cabb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 10980 bytes