Malicious PDF — malware analysis report

Static analysis result for SHA-256 66333e8334de0620…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 08:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 82f6d53ce0f23b3ef665f27628d2b840 SHA-1: 4c5f83e511624d92da3c65c8dcfb97774b948327 SHA-256: 66333e8334de0620ed20962dc51e09b1215e2a0ff8e9945e1cdd548cee829abb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

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 http://fc-junajted.com/upload/datoteke/tovanamixenamuvepo.pdf In PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/nojalofofufuvuvisusigi.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/jimufegozipulabet.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_AE96BFE03FD5C33E.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/77298038132.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/tapexoseruxapanixurin.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/64890141627.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0m77psafqbt5oqs5ct6qdcus70/lezifotisopufuzi.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/xuworurabibavinema.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/66735092662.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/jesaxarebur.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/31771988079.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lojupuredoralofup.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/53476615896.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/torijuworosaxisalopomegip.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65f7d4bd0---20967254592.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbe6df51f---78670515002.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1b4a34b3ed8f298738cc7f6c283c6ff2/56355646076.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/damojisarugare.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jugadinugiwidob.pdfIn PDF document text
    • https://slide-bearing.com/d/files/17421358263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=game+fps+meter+androidPDF 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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10652 bytes
SHA-256: 22a6bc1107f13c784058ea00c988583f77fe24660cb28b0bdf9c873a86c207ce
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 17504 bytes
SHA-256: 2d4c9860cc9bc4d9678b62a643f536bd614198936cb6078724432355fce94947