Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6103b036f8d6daf…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 16:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21cf8e3ae7e972c0807aeadc9cd6726e SHA-1: 77f52ec8c4ded4dbb5fb55f1b52ebd5722127742 SHA-256: c6103b036f8d6dafd13a8557866ec4706ec5b727f51dd4397ea00d8441efd1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm that redirects to multiple domains, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ef15234ee588c3dad2dd8b9386516354/14011001883.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb91f04c3---munewelunotewed.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/50597592872.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/mewijokapiredetifotiko.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/nimujule.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/difefimusosodinive.pdfIn PDF document text
    • http://compsult.net/userfiles/file/65288164746.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89753634164.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210908102509.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/negumeliginetebakupoxaniz.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/45185960387.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/88199981093.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/10709788667.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bekujolopimasum.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/wupapot.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/giwuragige.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/pudubun.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c85236e59---xosekojaxageles.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/gevarurofanakojunidusuk.pdfIn PDF document text
    • http://ciskmv.com/css/file/vedabifajolinazikera.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16135caa9bd96f---zogobiwegaju.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/litimalosesakasofix.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/61551244544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=japji+sahib+viakhya+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_off0000c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 19860 bytes
SHA-256: 1df4b939ccdc5ad09f8b45cd0994c9cd45053763aa7129e4741f64ed9e48d2d0
font_02_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 10884 bytes
SHA-256: 1306401c512710ee26b5a989115320c9322bb141450939653769552645b025a2