Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b82e50631b5104…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 18:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d21222591ed799d6f7eb0ca324cef20c SHA-1: af97273401fafbdf927432d1000d3eb6d920cf72 SHA-256: 70b82e50631b51045e675148595a3fb2e9f6ef201e7daf3e73d93cf1d4d418fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised CMS upload storage, suggesting a tactic to obscure the true destination or leverage compromised infrastructure. The primary attack pattern observed is the distribution of malicious links, likely intended to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.reenactmentmarket.eu/images/wyswig_images/file/20182599447.pdf In PDF document text
    • http://gleneaglehoa.org/images/file/54402608115.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09f333a1c---xelowozamafogakoke.pdfIn PDF document text
    • https://tmtteks.com/files/26527590133.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3a83199fc08ac280245ecb85187e8200/zimiguruponojuv.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625021345333519.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/5388942170.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a93ff20df---69764870042.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1256feec32530d353afb5c38eda3f79c/dusaponexadixodarapazunar.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/luvagajajetew.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/61841332677.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/67oakum5df6r0ih620j8qj3vnl/83799401108.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/29ccb698e2fb7b09d8190e9b16a150e7/90171153373.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/43754302004.pdfIn PDF document text
    • http://farashimirooz.com/files/zenuwotixesu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/67503626148.pdfIn PDF document text
    • http://stylekd.ru/files/kituwat.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vibovorulezododozuwamax.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/pexatupopalov.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3b5c90758ee218d4ed5f3550701f3b16/20983969889.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160736e6a7a115---dodusodebosatevuvifisa.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078976e57896---46504725206.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6dd6fa46---43691421217.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/34386789132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ecological+pyramid+is+always+uprightPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 17440 bytes
SHA-256: 4ae3283cec59d715002503a22ceb9484bc2e08dc77508328d5ad4b513f961f84
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 11008 bytes
SHA-256: 9f7790538767f38cd96fe015ee7cf4f0c81a85f50b48ca3baf01c988886079ce
font_02_sfnt_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_03_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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