Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24ab346d136edca…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 08:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77d84eac2db3221bf634dd9c6ebf4c6d SHA-1: 8570b2f25e73b0e38210e240f35900c8c1ceadd0 SHA-256: f24ab346d136edca869a627957143d2caa7c545c0a6a79de28f6e98485c2e2ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories 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 malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://crewmak.ru/uplcv?utm_term=1+trillion+divided+by+100+million PDF link annotation
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/vanagadigidenuwoxajuv.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/85187078186.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109101415465217.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xilujumatusegaximel.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/69745511325.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161383a8cd6b13---rorel.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/65600605727.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nunugoluve.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f12607286e---resumopejakejuxabudijuteg.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/jajoxanolagufimuwurenewum.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/zujujalibisa.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/jotojomumebidizijij.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/pisejawusofogibimaluxej.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9f1172ec---90941742441.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/gufemewofefoxutadub.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/dejodunitizasogepofixip.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/sefizumezuwumufuvagi.pdfIn PDF document text
    • https://epiphanych.com/images/file/82313124985.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfc9de0b1---tenizes.pdfIn PDF document text
    • http://chemicalengineers.ie/images/venirikizufevupedi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/62948169824.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd0b2eb75---modozal.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/serox.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/xabefowagusime.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/nipofijiniw.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6a9c4b84de612cd0c1bafd1180c4cbfe/69597374961.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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 10476 bytes
SHA-256: 5c37aeee52cc0279e587f30b7f1e622c50758d164eca1b9ea26ef200df30e11b
font_01_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 18156 bytes
SHA-256: 6ca4590b9624519343e22c650a4528d1b86c4cb586f848eb61d98d009e7f80ab
font_02_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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