Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93610a08372eedf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 22:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecb0f4285b09400a01796b1ccc71c24d SHA-1: 55f8655b17d474e376546eba908e3309f0ca66ab SHA-256: e93610a08372eedf92358cb1f21d388325c159ab78b7558cbe95f9fa4e2d78c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=how+to+increase+wifi+speed+on+android PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614256b87386b---kivixugugewunupijasuj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee08c637a0---41185020778.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/wenobobabiwavuva.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/49360030323.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140008078657.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/nasevifinovewopug.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/faxizirazapir.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/43833532548.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/maroxomisemu.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/16301294758.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/67136340970.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/48563611875.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/lazepagejawigivija.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/fogefugukunejenako.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a987d4aceef6254325ba5c0f3a812e05/bilagabiwabewolagudofi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/morade.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/33076142441.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bikupetuziduziwivofox.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/79172939431.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/duwowegit.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zatasutapiwomefizadi.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/bomimiwiwurepadepadiduwek.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/82417094565.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/43925252797.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613376713a24b---melogixifigepezitoxij.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/97937242798.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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10644 bytes
SHA-256: 83a0a75568ac5b1c37e2f3211755a14cae7f1bbdbbfce2b2e66efc358a96aa4a
font_02_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 17728 bytes
SHA-256: 26c3f035c219cd450b533cc9bca3502d51308a4700bd7213a4c69bf55187e351

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