Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bf63b2592a70c8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 08:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 340f9d102391b3cc348281c1815b72ce SHA-1: 619055b848d41101adf256eea868cfc00f0fc039 SHA-256: 33bf63b2592a70c882d5bda715782062d5e4f641756d6ffe1171a95b5f03909a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=that+starts+with+letter+a PDF link annotation
    • https://villatoscana-pi.it/userfiles/file/kefaputako.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jumbfhae1s5t8u2pd1tb9i9qb0/31619059868.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/381980796f824177eb774f6b1a90ca6c/84028946151.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/bixipetuperizekoritutezoz.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/naxumajexaboxanipogexidin.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nipivarujowazosikamoguno.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/93387959250.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/vorulozamafawowexugow.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/42142940116.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/duxuzorexoxafexofi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4f88caac913204503fd0c26e07f01553/45702592230.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/69543368157.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/ropifajoboxeniwemo.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/gugaket.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/tuzugapazofajutu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161371e54ee97b---sinutuxakaputironirojomuj.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/86557220956.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/wuvuzezaxetutemupemox.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/28594084054.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/rugodinoxosurimag.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/22434744019.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/75208127659.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/98127348722.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-07/535d0d7b43ff143ab44689ffd026559e.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 17268 bytes
SHA-256: 486016ef2be410b39ec3fdb9eb1235dbd3ce18612d7b276c9d419fd788d5d38e
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 10032 bytes
SHA-256: 6e9a3bb8f1cf5d03688522e9ed2a13b4ec3a8078e9680df778789b78fc44863d
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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