Malicious PDF — malware analysis report

Static analysis result for SHA-256 008a3b52fe8604d9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 20:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a7ca581cd54dffe24de5736167ce389 SHA-1: cf2928a52cd2a7914b9828e40bc4ba2b51230fe1 SHA-256: 008a3b52fe8604d9acf762ace96ac94fb0e4476f7873c5c07d3ac2b0b4d0a1ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nomylo.ru/uplcv?utm_term=kawit+cavite+zip+code PDF link annotation
    • https://hanyauntuktesting.com/contents/files/saxuvawilokalasisirizomo.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/89149492103.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/rexipunim.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/34021973564.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/44092148890.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3bb4882d---16593937420.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/sinepulazasepemazupupel.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/98638600845.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/58849446490.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/rofepasalaxigotasapogolax.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/50497365379.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16881711437.pdfIn PDF document text
    • http://sswjeans.com/files/54108859508.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/38705822540.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420085e3b24---lonenix.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/gowaw.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33530cab8---72422163541.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/lowimiromaluxibalumimu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec123dcd20---27383970742.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/39030146264.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a6g6ukcf5td0b2qa0936ean9ni/palowuwegavuvawepotibo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/72065891547.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/vibajutizisafibuloti.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210909105545_ya3eez.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/bokepux.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 17772 bytes
SHA-256: 2834391105112070ba2cc3d2ba7b6d5cd6bb3c7ca0ce298f1f00b4dacef036a1
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10292 bytes
SHA-256: 9c92b5291643847cb70660fc46086ca2a704904e3ca0eb38931231aa9d411c8d
font_02_sfnt_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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