Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6f113da130f533…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 00:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72899c4efc170f0ae14a7b10be5a9336 SHA-1: f56c7b75f47da0d3f1bd9d4121e3c36a44cf323f SHA-256: 3e6f113da130f53397f326cf00543e928c49bc6c5ad982603668baa745ec9881
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://lube-stc.com/ckfinder/userfiles/files/26692775251.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/xonikewu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a266318eac6---34913770235.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/30420940095.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee9800953---jefawuredakuwasapube.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/348f8605c6a290d80897dc5e49d72a81/nurapijemuk.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/jasupebasaruto.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199688193521.pdfIn PDF document text
    • https://yuktogel.com/contents//files/jovuzakukanot.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/dimupegapoga.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/32053804493.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290ded9f979---pijobajugudor.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/sidofivizedutubig.pdfIn PDF document text
    • https://telenovella-bg.com/files/63162230757.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/50708090964.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2e4j2hqlqs7jabo07kba2tqocs/nivinakijurewesug.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zakufireserugaf.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8fe05ce084b84dd5cd225a129ddbeaf3/40556330364.pdfIn PDF document text
    • http://bronia.org/userfiles/file/92561948329.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce269468e3---97938681959.pdfIn PDF document text
    • https://peterdegendt.be/file/75958062883.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/71918816812.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb66487e72---83915214467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=saifurs+one+word+substitution+pdf+downloadPDF 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_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10892 bytes
SHA-256: 9e32b075e3b1d05a23820b25b55a4c2058e383f0a1c8376b718c7f28ce1d00d7
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 19948 bytes
SHA-256: af02189d3b121a47d8f9a4fd5d097f3eb1fae3833a6c02176279f4e82585ce01

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