Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ebe1b4eadbdbf0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 20:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 495951815458b516f4753518c3cb6282 SHA-1: 4875a0ab004ce351fffc6408c9791a8881774b15 SHA-256: a7ebe1b4eadbdbf06a1521ec42cbdc343d5641770d0c483457386940564f95a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards the use of external resources to deliver a payload or conduct further malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a3e0cce8f0b96460ce5054366b594aaf/33775905757.pdf In PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c3aaaa86---79619758002.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/fanese.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3eca8d5b7a0702722848b1f9f0bd8eb3/2941170539.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/29393579163.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/39169846792.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/30097279306.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8e4398bb0c85d139fe8109ce739a284a/novaju.pdfIn PDF document text
    • http://ombs.ru/uploads/files/salezewogugisutegiro.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/42f947a22b9868fa9dbd2175c058d889/mefudojewototedowato.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29de033196---mepufiwabevagesiganug.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/nemasurut.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jinuwulozotaviwekebem.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/45841760741.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/vanivitebenonufimisavi.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/lolidukipuwowitubeguzuvo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/85066547440.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/musomobokifomuxuli.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/tugul.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608577b58a9a5---latepuma.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/90403203562.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-31/20210731101334447130.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107300426597928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tormek+supergrind+1200+manualPDF 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_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 17608 bytes
SHA-256: 3bcbd1e5b9aa6a77fec03ef5b8bc20ce65ed1b522e7e7713920edbdde983782b
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 11088 bytes
SHA-256: 476bed0b8690550f648ccd2136d35c8f83b32ba1bbe8f971ed53e364108ebb01
font_02_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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