Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf91e8ee6018e3f1…

MALICIOUS

PDF

80.3 KB Created: 2021-10-10 08:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 390eb0f70b1e7f7fb0942c87c9b95836 SHA-1: 6f02392be03f38cb97a37aabfce3da59e2625c0d SHA-256: cf91e8ee6018e3f12c3e3c312af969a5860153ea9ddfcc03a9465a5964f2bdd6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kawanmto.com/contents/files/xezetabuxalesojikisow.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e213f34457---54815409811.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r1o77cggdo1cfsitshihb2h3sl/81331307011.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/mozodizexe.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/95108136823.pdfIn PDF document text
    • http://mutitar.com/user_img/files/suxasabudipirulifip.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091607013793.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/boxesuzuk.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/97049592170.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/darazonivodorumiwoz.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/1047054489.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/34039547361.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140eaf116d79---819935199.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/59964410004.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/13424459064.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614234f987f13---minuxamebajesibulanu.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6150b561d727d.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/basimunatizodidabu.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/9530307576.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/ziduzufewod.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/watelowefunopofanitegogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=starting+a+sentence+with+thenPDF 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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 10504 bytes
SHA-256: dc68af261d6029b76eb0779c103144898a671cb1e6b2b641dc9a65fc5d6bb69a
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 17784 bytes
SHA-256: 71695263bb67e276d6df2af25cb2a9cb4628ca5bbaa01c8064d63da709b0e7e2
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1