Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32155199be57198…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 17:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e3e8aad20c457f4de1baf7ada53b5f57 SHA-1: 87da5151ecdba1a381a1b5055d7abc2d0c0f3039 SHA-256: f32155199be57198bf57a66f4550aac5b433a008c9b7ca6ce97b7eefedeee2eb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f1a559dea5a75610472ca4de75f02dd/3971040673.pdf In PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/xinitoselimaxidazevo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/tixetux.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/91618512902.pdfIn PDF document text
    • http://119pump.net/d/files/25951630363.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/54003071248.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/gazikajababenajugu.pdfIn PDF document text
    • http://contua.org/userfiles/file/jujosoforedod.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tewirux.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/6700891205.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/41kn7553ukuibq2ggdfral5se6/4662884111.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jexema.pdfIn PDF document text
    • http://samtekelektrik.com/files/gixidadupos.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630947202.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wewipefujigozavu.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/nukeraforulagu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wimusalopuritezat.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/41453697680.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca98e033a---43409924346.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///felaletidasuwexal.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/folumupikurozonujubevitaw.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/libubomitewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=freeflix+hq+apkPDF 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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 17732 bytes
SHA-256: 23d42a6b93301ea8d6bd597a048972efa2b58743de7cb2ee50bae4b64715d9f1
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10284 bytes
SHA-256: 685656f733d9af8e623cff8cce41a6c6fe4dd024b578299c4be1b5b7cc7043be