Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a479c8fd0a123…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 13:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e7757091767ad4a2653276871e5bec3 SHA-1: c9fd5393c978578a9bd6291d34d0a47c63500a45 SHA-256: ad1a479c8fd0a123228a6bd5b3f8b741c0d7437f20c19460734010bc3a012ba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage 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 distribution. No scripts were extracted, but the presence of external URIs and link farms is a common tactic for initial access via spearphishing.

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://pixomot.ru/uplcv?utm_term=hulk+2+full+movie+in+tamil+download+in+tamilrockers PDF link annotation
    • http://qunjl.com/userfiles/files/84556186911.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/nokugenewebozonatal.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/witafapus.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/ludif.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a318ed3d557---65820763942.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/77f8cb5cb719b8803320d955513a0728/15715103580.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/965caf6603c53fd749e7ff66c8f21d90/gefabesedofazepazoretu.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/24697417507.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609465021e4f5---bapuxoweluvutufilikari.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/44725746020.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/57447357771.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b6e3ebdf618f9c28e39c3e308a8f216d/17941781374.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tbli9oq4aluvl35jsc9tnq0bar/sekev.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/309500f239a6b7517b8ce88cecb4af61/32783665925.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/38477027593.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f508c4b317af7bf02c3e138fd5b85933/68938399933.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210721_947A1C39328FFB44.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5f8ae2646803e600d89d1a2bcd9de04a/tiroxesavuzoxuse.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609243141c84f---81593008987.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/jirofupelodesuduv.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/kudenivilejawolutif.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/95149260652.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/39a33f613151565425248818c6f52dab/majunosidimejibadirup.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/50506012053.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/914570e709a816c31a5e6d28737c0422/judubitizis.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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 11092 bytes
SHA-256: 19b6121298fefbcc35937a027f9ccf432966043db75e00a53a8f8c5f508e11e3
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 17104 bytes
SHA-256: 61c3829479aa7b3c5bdcbfae67a08ab04d67c9b8b342e878266db49ff8979f0e
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1