Malicious PDF — malware analysis report

Static analysis result for SHA-256 4222f6ed8afc3cba…

MALICIOUS

PDF

87.3 KB Created: 2021-07-16 08:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2abe874c974c32c567d845ea0d3f91d SHA-1: ab3aceaddaac443fa007a456e76ef9c1aac46713 SHA-256: 4222f6ed8afc3cba8f1e00e16572c2c632f0e77e97646a59d51e0af3adae03b3
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 functions as a link farm, embedding numerous URLs that point to potentially compromised websites, likely to lure users into phishing or malware downloads. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4863676d4f538e91cfa7fef6dd2460d5/18499931193.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ucg62bj267uftiakpuiu8gpt7/87400519676.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a9877fba271ad469f38dba9c863116/30548425124.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xaweliba.pdfIn PDF document text
    • https://tckontrola.hr/files/13992404017.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f0dcddca---55774993001.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/63031720206.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d158d6820a---22731881321.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ea7cf2df---18959992963.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/12800331682.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/patejemozewapuzoluxema.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/db813be185406c90979b063b8983f4f3/fovizaz.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/pumeket.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077c22aae598---91117538151.pdfIn PDF document text
    • http://mesterek.net/tmp/medesulisifufujin.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/zesug.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210615190651.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/93447764746.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/29adcc5565d42b92866079c4ff05bf4a/51272210695.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/53897040151.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/69e6d3dbb4676b52a338f1a45c86d00f/zojuboxunujuxiti.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/29268116404.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kudovijejoke.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/nadadobusenudajipeni.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/6414438473.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/57019197280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=masque+of+the+red+death+questions+and+answersPDF 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_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 17608 bytes
SHA-256: 5289ec2d10ec228234d5fb78fe5955071cafd68c2933dee7faea37e63f5764dc
font_01_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 10728 bytes
SHA-256: 34f1dcb7b3acace8a2967b953fa12b7bc9eb1a94f6bff410f5b2f7ada7aa7f4f

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