Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f6a377feb47eeb…

MALICIOUS

PDF

90.3 KB Created: 2021-07-24 13:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d86fbe5cd7baafdfbe70bb5881654d3 SHA-1: 0ef51ed53abc6429881a0b07b4f68a2bd04d90c3 SHA-256: c6f6a377feb47eeb91211bdcf1b2bc83cacc9684aa652d2aac7d63cd54d5c381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to distribute malicious links widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f6e707e976c497b892b028475cc0aef/genibanemefid.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160847f37989da---45361620244.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/94004183655.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/setivasofakatedaxov.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0b01f6fd686eb9b47b8291b61fa41138/14592636352.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a742b5e0f---xikibumunufubovaborosib.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210521055306.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/kigepuvujuwuzukaruxotek.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ccb2e4ae4---kegoleziferoxo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/c49acb103d11ef592a37b3531fa6d14f/21929645834.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b31830dc22c---70382651326.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081abbbc37f3---zupoxib.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a706dd0364f---jibezepepexodikukedi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b810f197d74---22061505399.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/29bc8c49014d18d0a0d750c9b3d1fdb8/mofumekemiwidegivog.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210620_235948.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zapuwufo.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tebekotemufuv.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/68471257621.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/sexazatevesafidex.pdfIn PDF document text
    • http://www.emailposte.com/pictures/53086960942.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/44360387255.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/zozujolumuwedevi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q3319d8lrjcb71i9og8onvdnh8/debetin.pdfIn PDF document text
    • http://18554080.com/userfiles/file/81902335690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=marvel+%C3%A7izgi+roman+indir+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_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 19420 bytes
SHA-256: e123149e73324c6dbc0aa8b405dcb51e434c9f15c402156bf5a91d9e90f7074b
font_01_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F51 10892 bytes
SHA-256: b9a7c88833b2d4074ea4ee23b9695b530f80ea5bad9c71e8de4edd562aae8ea1