Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8662cb249fed96a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 12:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0dee6009e21b57f9a9c7c39620ee345 SHA-1: f2970b09246b44dd5f24bf80a5bcd9719405f57d SHA-256: c8662cb249fed96abdc7f13a41a15ba1e00d32bbc1a7ee65083041b59c74a435
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan distribution attempt. The document's primary function appears to be redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://poaglasses.com/uploads/files/202109081851278080.pdf In PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/vebebamalujosisunijid.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/juranufawodulelesopu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/51567932703.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba71b02ef---buvonaradarod.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/remizi.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/744728662.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14ddc11ca---tomupireruroladoferamob.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vudogokenesapi.pdfIn PDF document text
    • http://cosyromania.com/media/file/48259139278.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12532251253.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab19524f---dotibobeboxemaker.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/50989691436.pdfIn PDF document text
    • http://gro-felix.si/uploads/48569661555.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/42726702039.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/81530791249.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wokufiwaxegodivanadosuru.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/052ed87494c8cb6e365e7bd2250b2259/70252961259.pdfIn PDF document text
    • http://torgradio.ru/new/files/file/gutobopofe.pdfIn PDF document text
    • https://agermag.ro/mm/file/80400785658.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pinujojetegitexonuto.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109030956112245.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bujejako.pdfIn PDF document text
    • https://expomediainc.com/upload/file/gilevom.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/xaxixibaw.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79036258414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+phone+as+webcam+on+discordPDF 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_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 17264 bytes
SHA-256: 477ab934ddde82d207f60b66979e2ab71cd7dc747c8f68ad41cb1f0a5a9ed5d5
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 11048 bytes
SHA-256: 8b8385bc4b0c4a62069a6bffcbeaa1892a8e2438fa5fa743b2fdb2f45631f7ca

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