Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60a3b62bcd3d197…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 19:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 279c98ef5b5eebf376f2adc27b7fa3b7 SHA-1: 9025073827f86057a6740089667cb288045cf0a0 SHA-256: d60a3b62bcd3d1976ac8d67a791f72063ae7972a96172d952998a42e2c42fc75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ketchas.ru/uplcv?utm_term=ark+is+fishing+worth+it+2020 PDF link annotation
    • https://avonsteel.com/UserFiles/file/bikuvopagito.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160801da4e9e01---6535368290.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/64736893700.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/ligimajafejelatur.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2jt96u90qeit8ugo4rv89heeas/zirirurufo.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/80673609911.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/denakofotugobarug.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ab33e701---52648058881.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/wemigorafasofubajofepon.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608942a4237e6---sifilogevizipaxofata.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97638027904.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a645388601a---bitivamusavugadigemelup.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a9fb4164---3751467851.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a26471b33124443e5674bf816d19f5fb/98956609749.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/26008340825.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/dusuwupikemuxodaduze.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/dedumi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e858e3d7f59---sajugisifu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e816b433---xosotekogotupadeji.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/joxunosovupesabasojovex.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/eklvaeiuftautp3d0e3v97479o/23110972850.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3vu8q6bqgmvomjuc9u25qoku01/26811571756.pdfIn PDF document text
    • https://castel.ro/userfiles/file/36925354806.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/74376786378.pdfIn 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_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 17076 bytes
SHA-256: 64b1b33b0745bcf1fe44a3b1fbd4e9e735b7bd63983b5990837f05d7d4ac2227
font_02_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10556 bytes
SHA-256: 55ff770a6f4c0cc600aba0749d983f0e4ed00b9ca823d9ad0aca59dc897e7ddf

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