Malicious PDF — malware analysis report

Static analysis result for SHA-256 031b73416da68608…

MALICIOUS

PDF

95.6 KB Created: 2021-08-18 13:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8c2e9855d59d50354f7afe81e67e45e SHA-1: b2f63a09a7136a569c6e98ac974ee47cf887a6b8 SHA-256: 031b73416da6860881836a2b2c63330edcad297830ce25d59e03b6dc1fe576f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5951ff7eb8fcd3e44f30cff67b079094/94304942843.pdf In PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/titirabedejor.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d112937653dc950cb1a68995de814824/14174104978.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/68420994530.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac598ec07ec---53839828342.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/jubupexus.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/afbf54f47f3366b7a469dc4b499785a7/73075679454.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/fipugopolutozafexe.pdfIn PDF document text
    • https://aneri12.eu/res/file/95504278253.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9eab6b80f---69961936164.pdfIn PDF document text
    • http://alptw.com/images/files/taxitizabuwapurikofusiwi.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lipijabebigedip.pdfIn PDF document text
    • https://okazionche.com/files/35525152622.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/kobukazavofiso.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/650493fad3c5349944561b7ec2342a3a/31794932055.pdfIn PDF document text
    • https://mmtours.si/uploads/sananokoxikopesazomilel.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80ede1604---gotobijoxelemalevifilan.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/38443465657.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444c7526ae---vipitewisifumus.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f54c26b40---25015238319.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0034a053---58794330546.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/mibijusijivebe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d058236d1---pefijagunidezafare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=historia+del+arte+bizantino+pdfPDF 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_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 17708 bytes
SHA-256: a1938dbab3df1cf304986b485a917dae7b60101a5c65a91c1d073a76e239843f
font_01_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FA 10680 bytes
SHA-256: 375685d8662eb7f54f4ae779566d33e8030883c163a7eac25b797f05265de538

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