Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cf8bf8a22b7a37…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 21:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ba6a5022d4cc5b787a0aa4bd2ebb19e SHA-1: 24dc150064980cfd54d7758215a335a801985afa SHA-256: 80cf8bf8a22b7a37681a8b0812cdcc3bbf8f37d8a260bf74f582eb468348484f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to act as a link farm. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=phantom+forces+hacks+2020 PDF link annotation
    • http://telek-trans.hu/editor_up/nijururaronobuneloxirab.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/9225388863.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/519558f205a73ed0aea3014c5e5f23d8/47261030672.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wufemitarexugidudijikipe.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vixugo.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/vorepasi.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/dapimemewerolofo.pdfIn PDF document text
    • http://honda-vo.com/upload/file/vawuwelupegajegu.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/83440424869.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/54530896578.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/97403047522.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1866715e8---givakusuzub.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/43247355339.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3j4u6c2j7k1ta4hhvufavpqjh0/3723665885.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/buxarunimunabajafexija.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/32d02e40057936c9f6fff40117100da7/tewik.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/49930238272.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xolodo.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/goriloforesidiwoteba.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/47646b7c774d4a6243c5392c108841b9/77482162710.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/85562989365.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gufurawajowovedajuwudave.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/57981559385.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wigodamogitutodotodu.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_off0000be9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9E 18052 bytes
SHA-256: f18fe9ce5a05fd9aa7f0f6e6dff1e5b9cbfc21e5f93ef7886727785ad930f968
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 10796 bytes
SHA-256: 46098e9895c93e6234c23ff72874ff6d16ef7985617a281a0c499c02cb990a1b
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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