Malicious PDF — malware analysis report

Static analysis result for SHA-256 97172ae763231e7b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8679029336ecab7a48c6f1bf8931d0a SHA-1: 47978d91ffb0261f44fcddec71578160e3976c44 SHA-256: 97172ae763231e7bfb2f535921c4ac4b4de65419db82c781dd428c0d9c17fdfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a spearphishing attachment used to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fokusmedia.com/images/uploads/52691605020.pdf In PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/5113996237.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/64482514292.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/xamobipumap.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vanipuworujezixinoxawosog.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/vurogemujulaxeposikewasid.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1021cb8f27411d1e4f91675bb36c5971/gefovawelug.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/weribaxazewunog.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/27813954343.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100f7458a08b---32431751933.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844329fd59---87888672548.pdfIn PDF document text
    • https://digireg.org/upload/gofubipufi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4f58f930---50847223852.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/vovuxaletedoxivulilulomun.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/38902708368.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/79445387042.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/11219536902.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2a7adbe9---79752469381.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b9afa4850e8b1fcd50ef68ccd52d80b8/firoruzawetedep.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/mavemusakuvatut.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/286a5af0a6cea2a8936b3bce68895315/8873416484.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac8353aacb---mudilazuvuxofurobo.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/vuxigelazilararesase.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609712b546024---xubebazabuvuluwumenekosa.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/papanojukebuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fuji+xerox+docucentre+v+2060+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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 11148 bytes
SHA-256: 52f568747cb80b56f951951d62a61933c1c01ddee7d2a046c68d8df8f87729e3
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 18168 bytes
SHA-256: 8d149cb3913faceab05cdcbdb8bd558a9b073444304ad129fe2692f741b72069