Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3df44edd570d89…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 02:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23d8311b84d0deeb8c5b013b6d938e2e SHA-1: ecb8bc19df73aa145a4cd6d40bbbab108aa50f53 SHA-256: 2f3df44edd570d89c21de78d87dbb076fb7861158a682937cd47bfcc664797f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, with several heuristics indicating compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://parejalecaros.com/adjunto/upload/fck/files/25887799012.pdf In PDF document text
    • http://mygiftltd.com/userfiles/file/96760761261.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ba6f015b7e2d6950d34d347d140595b0/mirowadeg.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/5565621453.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nivuwitu.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/73522015589.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/jepejinorisepozubewe.pdfIn PDF document text
    • https://jagominum.com/contents/files/riwilisumonofiz.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161434f5fe0590---32008580706.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/nugafagegukepefugugupuwif.pdfIn PDF document text
    • http://espicycooking.com/files/file///bunudewunilawagevogivavup.pdfIn PDF document text
    • http://jonme.net/ckupload/files/33077464398.pdfIn PDF document text
    • http://allier-genealogie.org/File:/88977328660.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/wafukawodimimopikiz.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/wavikexiteponixelomuvuw.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuwepokakizomevolumekem.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/16653925292.pdfIn PDF document text
    • http://protezas.lt/i/File/tupinusozududuwoputi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/wadogonesepivilu.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/97551888898.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26311238839.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd57a5e8e---49650545662.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jci4mnu5re7k00lj0n6st0hvou/xoposelaxozeveziwifasone.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/42959715763.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/rivesutikek.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/73409757331.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219108328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=root+google+pixelPDF 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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10040 bytes
SHA-256: 71f489854d4fa186e60a807c64294e3a6a77a66b6e51ac6459a1f070c846d8b1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 18716 bytes
SHA-256: 6236fcabb70e10b18162b31db3f3308459a518ccdab6331f85d6ef79cdbec4b7
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1