Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1644cf9522ba16…

MALICIOUS

PDF

86.0 KB Created: 2021-07-23 05:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 252846b5b8e786ba57c8c9fd07a64e65 SHA-1: 826d34d9f6d17cbcd8c994a2ecb2d87991c5a481 SHA-256: 7c1644cf9522ba160b62275aaea03be5e1c25fc047e1670bc33edb38bbca7dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kovove-ploty-brany-zabradli.cz/UserFiles/File/zasar.pdf In PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/79015051600.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/1433672209.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/63465843495.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/titejotojanewoj.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1p8q69sfk864qojl38j6lj0k8o/30060495326.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/21d8a4682695cdb7d79cf85ef78ffbd5/zemimogelizezerifowalef.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/68oobr8tk3boub6csup87geog8/tepakesoreke.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091cb985dc38---92450268329.pdfIn PDF document text
    • http://vhktn.at/images/content/files/malulibosapivosekumeke.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/mekifuxawisasamodiwam.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafadbc42a---13095138628.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b357c9d667---94946296488.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/99cfc5c48dd62689627e3e16f8d06a19/jajodojukogugururajume.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e73e20ef275a71c197099f6a5e315bc5/fediraradilakuzexokor.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/5129808881.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/fuwomiborusixoxuki.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/zemadawitofutawika.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cfec7a50a---16503520531.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/75951976058.pdfIn PDF document text
    • http://teifsepahan.com/files/file/vawaruzirobije.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/713857348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iphone+does+not+receive+callsPDF 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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16688 bytes
SHA-256: 0fdcd6c77aee2f49e42264d1496281bde37978c5966b991cbbf4c3c1037670c9
font_01_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 10628 bytes
SHA-256: 4b441430cd512e9c4002c16a4ff49c0caf9f8c8bf74e8c2fe6557f1088a191cb
font_02_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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