Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cdb0a4a3a52c12…

MALICIOUS

PDF

86.7 KB Created: 2021-07-18 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ead0ed2b4e630e790c392659b238ba34 SHA-1: 428754023e5c28b8cc8b2b67aa1b11ca37bcf28c SHA-256: f1cdb0a4a3a52c12aa4f494ef1d9e4e6fa7b97e95b1f47e4379c1cdd24aae275
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bensonhigh67.com/clients/55910/File/81678366234.pdf In PDF document text
    • http://cn-noah.com/uploadfile/file/60689222334.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/76694283645.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/2356251976.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/vofituzivumasenop.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/xijirimalikovenuxoneluv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fa054a6a56eac2e1d09c12c82060bcd6/61166059430.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/konitulawifezegaturasexu.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/natulorisu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/can5q7f5ap7adrdm6uom40hfgg/wafewotipi.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/22490579258.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/32df966d694b07ea3346761251f5068f/zetemagupumawejidazibo.pdfIn PDF document text
    • http://mesterek.net/tmp/loruzilabux.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ce0708bb1dbe00d88256007ae6795cdb/zasetovimiliwuxosego.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/vogatofidilakunix.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe69599eb---748154675.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8267eac45e---disakexilukoboti.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/14841321541.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb17937b9a---musenomo.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/woritunurikirom.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b34766855---54739379460.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c387ac3e29---mimat.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3552eb8cacd8fba26f52ae85123fdc86/26096613500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wow+classic+grinding+guide+alliancePDF 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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10628 bytes
SHA-256: 39274030f21be637ba68cc236efbab845b304d2ce9dbf3a635998c524223d74b
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 17220 bytes
SHA-256: 555800f9fda5462f0fa6b660d82543167c40cbb616af78ccb9f7c04618c2bba5
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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