Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e39f03146a37ec6…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 14:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92d066bb4d234b79976e132024d4e7a4 SHA-1: 1221801045a56d165efcbd4f62ca27f50981d19a SHA-256: 8e39f03146a37ec61616006a4d519fd2b11605d6b432442b57e07982fbd8d31a
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and the nature of the URLs suggest it's intended to be delivered as an attachment in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=exerc%C3%ADcios+de+vestibular+sobre+figuras+de+linguagem PDF link annotation
    • http://worldofpacifiers.com/editor_uploads/system/files/kewumoti.pdfIn PDF document text
    • https://energooptima.hu/upload/File/10821973659.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/tozekomolonatunab.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d664b0054a---44453620967.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/wudav.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d650327c---naxefovabejapojozomu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/71b8cee26dd20f1f331b73cfa72d68f3/ravuvoxupiza.pdfIn PDF document text
    • http://lucann.com/Upload/file/xobuguwinitenakakofulex.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fb63daa7---46642911762.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c77f61ac4---xosipipedowetojivaludufod.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/88306341147.pdfIn PDF document text
    • https://jurad.eu/files/file/somizibememubapi.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/muvasopakikokofulezosoge.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/14893607352.pdfIn PDF document text
    • http://abpaluso.com/upload/file/13118853597.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607578b37a3b4---gotelamoxex.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/labezirunerezaxitenijilo.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/polat.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/xiliwafu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/mevewezugapojoxusewimet.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f10618c596211d1d1f27d73b6d6b0c79/zupejagajujaperirazitalu.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 19960 bytes
SHA-256: ce850ef8fe1fd411cc81cf6ff5ced035f284a45919ff524c542e71caa9f69ed0
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 11272 bytes
SHA-256: f2549fec6ec173bbf5eac228c7287c369b03cde83277c1f54f15c229c68c2e9a
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.