Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcec06477d59c25…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 23:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69ed169e202402da023e842fae18b27d SHA-1: e4dbacb5eb310184f8d18caa56733b5d8de7eb7e SHA-256: abcec06477d59c25c5ac61e2a9ceede8f1438d2d54a857d48b48406708814091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://drafthe.ru/uplcv?utm_term=convolution+theorem+examples+pdf PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/peko2i1qvuqk78mjudpkb7s2lj/16531375383.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/63102157977.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/26093692199.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/lejirakalibu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f760bf553c2ad34b3b1545e5682425b0/28912437022.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/32c92ff1b1a554a0a7774ba5ce927104/90464575144.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd2c80fb26---87773897039.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/81811942775.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/beziwatokupubakakazolo.pdfIn PDF document text
    • https://razredna-nastava.net/files/45467091177.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/18392218719.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/nojojepimadizokokufivabe.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/87396637607.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4891bfa4---46643082361.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098dc03d49ce---merisexixifomi.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/72204572615.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d074e235dee---89342757117.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dcc8dde3ed36e3f32a3dd2967ef46d3f/70707144806.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sobixites.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/12873ad80a0692a79996b29702379062/58746940483.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210811104358.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/vidasixerugitudagezod.pdfIn PDF document text
    • 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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 18456 bytes
SHA-256: 3b0dd6dca1caf61af1a127f80999697be1f9bab0cf2c2c9c5c7bebcd5b4959b8
font_01_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 11064 bytes
SHA-256: 3398674bfbcae311a3c81b3400d29ee51dd1e78605dc1e5c6a9711ed77d1d540
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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