Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcb972b38a78ecf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 10:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ece00ff993f542dbc0e0d3c92f08016c SHA-1: bfa81e62c867d78b270f149b321261608c75b1ba SHA-256: bdcb972b38a78ecfa586a3ac36102a7294d68224d4d205c8dcfc8405c8df589a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that redirect to external sites, a common tactic for phishing or distributing further malware. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/77679101009.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4f3c16f775c8f44bf7bf036cf0aa034f/74504250709.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161318de611033---rojefaxewivofavukupukajo.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/65471817294.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210914003120.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/mapuvujojogexab.pdfIn PDF document text
    • https://unitjaya.com/contents/files/tolesogefu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/mejawat.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210905_140433.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/mibipuruwomavejukimuke.pdfIn PDF document text
    • http://sbairs.com/datas/files/zijokotivixamij.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/8198161453.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/78799558136.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614251117a37b---83488050096.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/16382660152.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/39856542181.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/29ee1b5dc9380f550c4a498b931af9f9/vuxerukonisu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2c5eac55a4870986f6e9a72b2eb96386/8253491961.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/56166482730.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dojigirinaf.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/barenopiroxoxulogi.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/zujoza.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/70284632057.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/11552774032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lightroom+express+free+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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 18096 bytes
SHA-256: 62c502ea2e4331992c912db073167099b720e0eb0ec54375e3f98edd4ec36e1a
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 11092 bytes
SHA-256: 01a2f9698f5f7b3406cced4c6ac85d2ec789ccccc11c47b8e5d9236d7dfd2493