Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03b49ac17a9ebc5…

MALICIOUS

PDF

82.7 KB Created: 2021-07-21 08:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c9a642f9ef7083d5db0b07a5fbc6d89 SHA-1: 8db53aa822c3c7bef966d35720a812e868ee4ef0 SHA-256: b03b49ac17a9ebc59be577bb27c1af7b4ca6e0fbce0f3719504ad6f44d6e8a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb561615b2---16204684949.pdf In PDF document text
    • http://goref.ru/files/file/32946208062.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/88641246561.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/kuxomurikimojosimo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/71710017734.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/939ddb61d43bda3a2eea5796fa822c43/65160817214.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fefe335d579c462702f7ed67bf3b2237/45128616980.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vibunitupexosi.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/tisojedamol.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0129701877bc2e5ad631f78ca6fb88c6/79924388617.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/20200746590.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/95525803953.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5948dc555---wevixujapelikakopew.pdfIn PDF document text
    • https://btegypt.com/file/66989583624.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/39d9b9e6c9f7c590a48593f75c509c89/gakogoke.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210628_97582646327809A0.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/88195524445.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7b58d2dd---jukamokuzefaxunivupage.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7c6a53ba---zewenizopej.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sirevotozatuxowokasaju.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/3295800389.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pumamajavasasuzakufusov.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wobabi.pdfIn PDF document text
    • http://zgic.ru/!upload/files/16983607279.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b0716ec3---18017294769.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/607250541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=plies+the+real+testament+album+downloadPDF 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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10840 bytes
SHA-256: 0886123f3083a8a998079104dcd318562bb1b626161edc7974167dabcf82e2e3
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 17912 bytes
SHA-256: 0a45c748e0ce370167313efbac0989dc2d9a8f87eda1f3cadc015677fb61d24a
font_02_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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