Malicious PDF — malware analysis report

Static analysis result for SHA-256 62040aad85edb2c1…

MALICIOUS

PDF

80.1 KB Created: 2021-08-18 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a6003ba6ac071ca6ee60c3d729511252 SHA-1: b8158a8e5f35398dc6ea9148bae66314610553c8 SHA-256: 62040aad85edb2c161d370344d6a7a0c448d2054326301f9b6d8ab6c71909f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure strongly suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://pistant.ru/uplcv?utm_term=strategic+management+concepts+and+cases+3rd+edition+pdf PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/16462946478.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6188a3c1---29581709177.pdfIn PDF document text
    • http://usateatop.com/_upload/files/13262791435.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/14406401565.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kirusiwadudi.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/76884178577.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ff4653af1b7c3ff3ce100405bc5842d/28736219581.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/33430715705.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a376d29fdd1---gezuzirolug.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/uoakaj5tn8ba0nucl8jdole560/zetetawo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/82399658070.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b402f29f54f---dunijuvijiwuwal.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fetol.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714fc3712b4---maxejezefezefeserew.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99687a35f---96200551924.pdfIn PDF document text
    • https://autopratichesas.it/file/38899659395.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/vipavixugezanudamekokam.pdfIn PDF document text
    • https://mszukam.pl/dat//file/6969151034.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/nejiwobuv.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fojulazigekobomureno.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/30720772956.pdfIn PDF document text
    • https://digireg.dk/upload/48270941723.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b6a1552365fdda405b5680af5d57f281/46172739235.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/94348101876.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c6285d76---subowu.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/nadigifogagu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/fuvofevujesovapuzezoxoIn 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_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 17100 bytes
SHA-256: 52fe15acc89a33831b45633cd76e2cd0f47cb7230fa817df99406481d99b6cbb
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 11164 bytes
SHA-256: 02d399703408ad31e08ec14ca53f54302df4a384d96ae4235576aaac618f818c

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