Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d233bbd6110a77…

MALICIOUS

PDF

78.7 KB Created: 2021-08-21 07:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f41a8efa211ee0419b4f87294604dc24 SHA-1: 93dcb3e5c0d4db2ca5c568de6520e000e903d2cf SHA-256: 59d233bbd6110a7734e66261855de8e4bbc848640c4eef9d38d22be3402110f8
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 likely contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botosani.ro/img/uploads/file/juretaxerimow.pdf
    • http://dansensvenner.dk/imagesfile///33861523732.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4d767fee974a3462fbc236faf2b89d43/1040865650.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf864eef4---55378388077.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ce90b3e5b2fe684dbfa59199fdfda00f/mekikonulej.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc5da3f0d---79444144704.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42307b064c---moloteragamisodoxew.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9d55t17bsbiuemlvo99p8v3sn7/97735436147.pdf
    • https://soudurelausiere.ca/upload/editor/file/86747606848.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ec0bc29a---sufosaz.pdf
    • https://akproauto.com/nbloom/fckuploads/file/64719680984.pdf
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/xililepisepakabir.pdf
    • https://kidneystonetreatment.in/userfiles/files/nirapefomaxosu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bce0a249e22---xodejidumetiwipugawa.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/wujiw.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/tinumusuxufoka.pdf
    • http://csim.jp/ckeditor/uploads/files/98509831211.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0867a99ce---45836912163.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d042d5fb0---jejaguwiferemomunozud.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e95e6e914---42350851645.pdf
    • http://flagrant-desir.com/userfiles/file/27276170683.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/jirelujoxosixekodareb.pdf
    • http://flatadministration.com/uploades/fckeditorfile/71465132055.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=11+s%C4%B1n%C4%B1f+tefsir+ders+kitab%C4%B1+cevaplar%C4%B1+1+%C3%BCnite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb33.bin
d41457944e732c4bf5ac223d3011c7c3b21fa059df2d1884cea3b3d7f97898d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 18900 bytes
font_01_sfnt_off0000f8ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 16792 bytes
font_02_sfnt_off00011116.bin
d831ba4b05de2dfd420920ef282b1513c03d22ae4b409128f63506861db57780
pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 10984 bytes