Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a65e181b7e85d3…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 08:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0443eafdef96a92bb92750bdf9537521 SHA-1: 6770dd83d4ab13cce35da4aad423ff899bbd32c8 SHA-256: e5a65e181b7e85d32e5cc24a1b453c0fb086cef5d61babf116bf09c093098015
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload storage, increasing the risk of users being led to malicious content. No scripts were extracted from this sample, and the document body was unreadable.

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 http://redskap.ru/userfiles/file/wudesadadu.pdf In PDF document text
    • http://rspon.pl/images/wyswig_images/file/68660158928.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nhv50dc1pka3o5s69k0dfu35b2/77957616171.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e20b96ee070d64212050de6b7c851b31/81115638791.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cb12435ce---robusigakigifitedanu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/97251174055.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/866423795.pdfIn PDF document text
    • https://seikai.jp/free_images/files/tadebumedesedej.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/wusadutakozidu.pdfIn PDF document text
    • http://tchid.net/userfiles/file/putifotejoxejaxaveva.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/60095227829.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5ccbb58d---kimemolaj.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/98263980267.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/luvimaruz.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/nulobaruwomisujad.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/duxotavujojevunixelex.pdfIn PDF document text
    • https://nls.vn/upload/files/63932576352.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/91478903952.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614479f0e518f---49192413671.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/tivagazolewaw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223e38cda6---nuzediladadujopelupeji.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/51214532739.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/zupovazevisaneli.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/taxijuladafigabasigap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=scarlet+heart+ryeo+ep+1PDF 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_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 16540 bytes
SHA-256: 68e8f740132d87fffd400c17867ab18676316795c7e8da2f23eb4a1595ab6545
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10348 bytes
SHA-256: f70ca9baa18e3efcd2f6a950bcc46af4672296e31b7cf033202c166a58b6044a

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