Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d55894edc646ac3…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 17:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab9fe25c28af5ab7452ae77e62e9feec SHA-1: 83452627e1cb95359f9a11d08718db89463318b2 SHA-256: 0d55894edc646ac395afd040ec057c0b6ef7d1a1e1efe8252b34c2a3e4b845a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ac542cb---70678113338.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160add918905f6---13522628022.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/pinesumotilenuvadezilu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c013dc4d260be71a87636fff837183df/23938587379.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/janatumuliwevelazekefu.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/22642024048.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840af526035---54472950570.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091556715480---2149649122.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc070168a0---53943340434.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef391c0760---98650714050.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/7832145296.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/40704185655.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07102c87f---52555091689.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8fqeue1rfra48ah2ro79l944o4/63858460324.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/zulevitufapoj.pdfIn PDF document text
    • https://landi-bg.com/images/file/jozoderigiwepukusata.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/80988918108.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfab096ecc2---tulubetanolarukow.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbedfcfbb8---69020923943.pdfIn PDF document text
    • https://mszukam.pl/dat//file/89213861743.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073995f79f58---67859653857.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/39251191192.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/34oltqsja7hgu518aglkueg9c3/moxozimuvixefazukenusunij.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/luvagajajetew.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608466a345d7f---57043400213.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c845d246204c5a4b54214a5a7c66f7cf/50306521199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bs+and+aPDF link annotation
    • 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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 9704 bytes
SHA-256: ef4abd72e886429355f5e9eb3a1ab4b068a878157edb726c1f2a47ff8c7ba201
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 17152 bytes
SHA-256: 5aa421dda1478bed28848bc8bc3e500d1349d1f09e34d0b1fb1ba951a1d67504
font_02_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1