Malicious PDF — malware analysis report

Static analysis result for SHA-256 507c8025cbc4f933…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88553ff1ca9d78e5ec89b2fb6b693404 SHA-1: 6fa0dca50dd84da07dec613bd3266aa61ec287ea SHA-256: 507c8025cbc4f9338db439065363c31fd137409fea6541821b7281885112b7e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=cleo+mods+apk+download PDF link annotation
    • https://nezrenweb.com/calisma2/files/uploads/warapeguzibilasoz.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ce074a5---poveweteduramuwelot.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/buroresewanapemedaj.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/fegodekerijagasikubope.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lopak.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/68116907109.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161300a5ba0bc1---81607703195.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bozaxuwozimetasi.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/28363385672.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/tumib.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/27146135502.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/57192116126.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sb4nov7vbajcurm24nt1nctk52/wabonokemadab.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/budoxevabuseralimojola.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/76607972882.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912020258.pdfIn PDF document text
    • http://turatabor.hu/media/lodurezefiru.pdfIn PDF document text
    • http://horvathortho.hu/tmp/jijenafilawekud.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/92939336475.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0140e2d02---naxulavitofigo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sevotezawefewuf.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/wutuwexamerizimu.pdfIn PDF document text
    • https://tcremich.lu/files/files/wejibetebuxaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10472 bytes
SHA-256: 62562f7d80725870a6c8b09d5958c2e454ba91655793b4a2e9b6969daf903972
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 18936 bytes
SHA-256: a09a45806be986dd7989f32760bc68285471986065f7c4f0f318a575cc7c1f92

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