Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd865d3fc1decb9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 21:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06feab5026120256529c444e1812bdfa SHA-1: b2bdb8039bf04b6e36686ad19e43ef612d21a116 SHA-256: ccd865d3fc1decb9e18af3313a3942ee99a9d1ebaecb7ba8bda6946979500b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=constant+of+proportionality+and+slope+coloring+worksheet+answer+key PDF link annotation
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137979827a4d---buxutepazapedabule.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/93724812085.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/fiwixomivutofo.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/63192230265.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/mivofesunudekubofizu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1d867e3f3d5ac760f36afc64e91a4d/pezapafukuwonijezaziro.pdfIn PDF document text
    • https://digicpictures.com/downloads/11126794367.pdfIn PDF document text
    • http://jar-ted.pl/file/dabepanip.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/todunafojugi.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/29930533061.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/kanozufamowakuvabo.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/70206933264.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xuzegoxikubinagetuxodix.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dedidodezef.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/xopamikujaj.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/69994384032.pdfIn PDF document text
    • http://newworldss.com/uploads/file/voxomuvasebugavafizuba.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090701162673499.pdfIn PDF document text
    • http://toroisg.com/public/images/files/xudefizax.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/wopene.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428eab66db---15020238161.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6b5126b267e3e5f61bab4268e14c316c/kinamewo.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/moloxifenasifozijuwifor.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/lavadakakepakewajeg.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/96197005331.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_off0000c111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC111 18024 bytes
SHA-256: 2d022504de655fe6863f15b0a977e3d16220f845a0c2fdbd3ff23d2f1f4f5f36
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 11220 bytes
SHA-256: 7ff82ebaa09db914d3f66bbf2d6716f6050d0f3581256741c599173d92d6f0c0

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