Malicious PDF — malware analysis report

Static analysis result for SHA-256 61261b41c4c9755f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 17:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eaa80fc16eee81d087ced1c29ee3894b SHA-1: 47dd71b579f318f05a9ea5d7ca0afd445047fcea SHA-256: 61261b41c4c9755f64e469e46ad3a02d3c663522e7395c6b50d9743d58ac7902
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614465cc9c69b---zegasusasupid.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/599976b24971e41620c55abe454cafa1/45247325950.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/92744180004.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614045001f1f0---tazusasigigamonabexujawa.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/jovotisenokiviposab.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/ridulitiferabemoregiz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jomizivisaw.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/rulut.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/sefugudegitukonamawug.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/3106649153.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/20235612816.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/rupazukojedogil.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/2930409073.pdfIn PDF document text
    • https://777mto.info/contents/files/vopizaraxiwivogule.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/nimogulipusamudere.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/99832828018.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/rebegonutadu.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/85189473902.pdfIn PDF document text
    • http://oris-am.com/editor_up/63530882495.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fe6f17e57bf217be802fa19d80765ff2/labireforeraxujuzo.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mujezazu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/45480731371.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/6387195274.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/72750145431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mouse+toggle+apk+for+firestickPDF 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_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 17400 bytes
SHA-256: ce32bed0a5682189a8baa0525782d5c134a66ba8ebd55b666933033e943186cb
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 10736 bytes
SHA-256: de564b0459e40d8aa90616a49dc0e41144a7171609da0bef41abab1ea3bcc5a1