Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb09e08aa607619c…

MALICIOUS

PDF

89.9 KB Created: 2021-07-14 01:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b468932017355972a1b978fbf98e15b4 SHA-1: 4d3125240bc929e2937abb2a1d42ed81c448b128 SHA-256: cb09e08aa607619c790aa75a2d3d60eab6deb98d91404153fdf3f3cac7fb57ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on potentially compromised CMS uploads. Several URLs point to PDF files hosted on various domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642c5878de---kimusezigipapolu.pdf
    • http://sacoorhealth.pt/site/upload/file/87889390461.pdf
    • http://lycee-elm.org/userfiles/file/tolepalujadofeti.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087979b2c94b---84431496461.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/1112005591.pdf
    • https://caribemed.com/userfiles/file/1105934726.pdf
    • http://guides2alpes.fr/uploads/file/sofuz.pdf
    • http://polymer-optix.de/userfiles/file/9711958132.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2069a934---23910334222.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39cbba822703d396c4d33d83ad1a1bae/81491370725.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4145bb88a847eb4f1d14ae5768dd90c0/67571702304.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b10475a482d---jajekuxupetonaze.pdf
    • http://akkoryazilim.com/userfiles/file/wamebas.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/pazaviwixus.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2a5a4c6---kutov.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/vijuluvuponodazut.pdf
    • https://africanresearchcenter.com/userfiles/file/58781442013.pdf
    • https://asset-books.com/userfiles/file/83864270399.pdf
    • http://miltonhigh65.com/clients/874455/File/75453061205.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b007a02d044---xoxavidenupebofe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/11vqb19pu5bqgoqt6avofmnk12/34081178069.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991179368fe---dosenekafamugal.pdf
    • http://smclassof57.org/clients/34860/File/kazuvimil.pdf
    • http://interreg-ipa-husrb.com/downloads/77724704307.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=grey+wire+haired+dog
    • 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_off0000fc51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 16792 bytes
font_01_sfnt_off00011468.bin
debd79e9690cf20f451a4c873fcbde1fcef7248c007803c973c7b72e5e5b8a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 10348 bytes
font_02_sfnt_off00012bc2.bin
60e61fe0e16b4f1a589c87db72351d79b1d912ad9f5366b43210fe8bfe5b1d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 18088 bytes