Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3f87d0ddc6a9b6…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 02:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 345e95a46fce20410c6ce6aaddbc174d SHA-1: 23861ea30c7d7f1c1cb03567db7635ef8b3c2185 SHA-256: 4d3f87d0ddc6a9b6bb16e7cf85d25280498ace3d29970cf41f00f8e612db1b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term=formule+d%27excel+pdf' in one URL indicates a potential lure related to Excel formulas or PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=formule+d%27excel+pdf PDF link annotation
    • https://maydangson.com/vietkiendo/upload/file/60636301729.pdfIn PDF document text
    • http://unityproductions.com/upload/files/99923112143.pdfIn PDF document text
    • https://mmszke.hu/files/file/tamini.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161138806c23c4---zejazenug.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c1b9f815b2971b495f35810b3ea3b570/42032223666.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779fbd7c55c---tabupuzapugajuwexebuguw.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75dcc94230---88067747701.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373345b9f---dilevujol.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b22e18f57---xukumefulilowifewo.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/54515806684.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/28226336784.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/18652062687.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/m7pn2f4mqn21rcgelroe298d96/59574744708.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/fozogineganixajapifaruxu.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/vitaxaw.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/46722997886.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/bozosodib.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/59983492411.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/34128835533.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/22715786251.pdfIn PDF document text
    • http://fullx.net/files/82233980857.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/kaxijefurigabozos.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/kutemoluxomatevasofegewo.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/barokugijoga.pdfIn PDF document text
    • 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 20304 bytes
SHA-256: 445516be043074996d119a657c69724c5a40b2c80a6b3a8c84496c980057bb94
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10368 bytes
SHA-256: 7408d1ccc5c8303a7c352b37007566332613062c4d42514c673d5b7ee912dd39

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