Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fac42f16f7c05f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 17:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a92c2d32d7a43f082daf492848e6484c SHA-1: 4b546591918f9592a1c8778f970bcf690b30aa99 SHA-256: b9fac42f16f7c05ff658642ef53f2d30ab2b3da87ee4694e18bd505ad4d95a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of external URI heuristics and the sheer volume of links suggest the primary purpose is to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=ringtone+creator+by+name PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/91463935346.pdfIn PDF document text
    • http://gapp.fr/medias/files/35868702636.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mitotutakore.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/24807855011.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/13688688415.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vanule.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/8590322533.pdfIn PDF document text
    • http://travellerisland.com/files/69856708832.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161446db9ce000---64879649097.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/44145463443.pdfIn PDF document text
    • https://artbynela.com/uploads/file/pipumuvurizaruwamofu.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/wugituzivoxag.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161444d30aaef9---nugipuvuzomuxipedav.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021914161523639.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/6262466010.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/19196514518.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506aa26b61---30796587118.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c3fiirtd8aonmvonlf5k8hmgo0/ludoxijiditevixuviniwik.pdfIn PDF document text
    • http://kccmaul.com/files/files/pimij.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/42800940505.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613329709aace---23555196568.pdfIn PDF document text
    • https://luminex.pl/upload/file/93710979802.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/negunafazedi.pdfIn PDF document text
    • 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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 10656 bytes
SHA-256: 529335f4b9ede3c19521643cfb52de1886bb3d63694d32d27788594143dc9e7e
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 16772 bytes
SHA-256: bf6afe3e04d031adc01dd9867ad2811277c701b3531b82bc342ae17fba5a7007

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