Malicious PDF — malware analysis report

Static analysis result for SHA-256 8412cde734984ce1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 19:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caa5033136f502efe837410b024dd199 SHA-1: 75447a63fa5da04e0735741938441a342ae680b4 SHA-256: 8412cde734984ce1b2005ffb50d7b96ff72fd95604607081d76f87922092a1cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users through these links, potentially to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096347437bd2---29728241458.pdf In PDF document text
    • https://efckrakow.pl/userfiles/file/bojiz.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7a32e37990f16eb4e74760d75bc46a96/tovuba.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/gupumatiwugexebusimi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0905659f---85769271737.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7449190cd84f56f35964dc63751cfe9c/tukivujo.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/wenoteg.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2t9tvi2tvf8hj9kadvjp40qnre/jowujudam.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999888376ad---55451478055.pdfIn PDF document text
    • http://veivel.com/userfiles/file/zupusosudumenuwonavux.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/wofegevexuto.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/38196814145.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/lemuxe.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/61866645923.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1e09bf301a0557117460b7753837e805/zalanolutitabi.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xifevatawefusoburokuriji.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/lebovoxexavavarur.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5kjs7b3d1bfuuqf5ql73i9e3th/96129409751.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1sk7975vhh9pkjmqmilfb84tc1/94472705076.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/7246176732.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ee33049d445a12b900814b71f75b2868/misorujutufafo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/91202332614.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dofepogukikiwikadovazovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=non+verbal+reasoning+worksheets+year+4PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 17540 bytes
SHA-256: 56d20cb5e2f228ed650056c5f45539f8b806f5836dd04ac7e51818ce067a8374
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 10940 bytes
SHA-256: 06c7108d0fab6d325581195544bdf384d2a38d4227e9de2fb74e684e89e9464f

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