Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff57841957b8ffe7…

MALICIOUS

PDF

73.7 KB Created: 2021-07-17 12:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6bb34aebd8694c7d8d8b434ec3ede05 SHA-1: f064ce2c951a6e8dae89f79c3b649a82d83e68c9 SHA-256: ff57841957b8ffe7be2ef32e429e5252b4a9fd751c97ebd2be620f1942ed5cf8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://woods-china.cn/ci2/userfiles/files/20210622194635.pdf In PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a23c2167---rafomadifapufodedukowufo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/nevatufelisodorazuxifa.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/mekovibil.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/27603394828.pdfIn PDF document text
    • http://policylic.com/uploads/files/sesanevodu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6fohui401u3b6j20eonqa3f5p5/rajam.pdfIn PDF document text
    • http://flirdining.com/uploads/files/wiwuvozufi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/43348234412.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zoxokoxeboxizegurupegufe.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/85777844840.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/desuwitimekuxesexu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9b85d33962f51794e89c9838d54519cc/resipimisazijibidoni.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/medukeraxofoz.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/22542520450.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210524210703.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2060d6ad98---59359498858.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/zozimukovabefologaxidag.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/geledanodifatukef.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b45621c2---xugogazizevomuravadejo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/23388001854.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a590afd1---20860819116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hall+county+inmate+populationPDF 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_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 10472 bytes
SHA-256: 9376defbddf5bd1bcff8a9e25d61fecdd6f1ef2887a2270a51afc723c258e971
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16504 bytes
SHA-256: 2f769fa5bfe814f7fa7248d200aa06b82fd217fd00c5b204eb4b872293bca78d

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