Malicious PDF — malware analysis report

Static analysis result for SHA-256 667ee080bb81d3d8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 10:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5f821300ab540dfd15b5d96300a7f490 SHA-1: 597db2b873f7f8b10d0168a561bfa645f6cedc60 SHA-256: 667ee080bb81d3d8d9b41fa6a12d6ad994cffd090ff2311a51eb42b7ab9d5fff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into believing they are receiving a password-protected archive, a common social engineering tactic to bypass gateway security. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, likely serving as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=mixed+times+tables+worksheets+up+to+12 PDF link annotation
    • https://serviceservice.eu/userfiles/file/16562469378.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/11750600259.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zujakuniwefalub.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161141c5f2a2f9---lakamate.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/botazuk.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/wolofudagozizetutobuga.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/naxomidevabinuganarixa.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/51361402305.pdfIn PDF document text
    • http://sushi-belovo.ru/files/25249291617.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624623877mijomivikiwi.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/64565351660.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xodopitisisix.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8c7d9cf29f38246effaeee41eda615ab/83651172034.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/remarifixe.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/masepotajosimibuwovab.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/47393422138.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f94fd5dcb21e77ac270deef99b8a1604/topapisoxejoredidurev.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/gezizabexemumejizulafud.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c10fd6e94a1762a7e33e44f6a7760eda/telezedegubewazarunibek.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/depekubem.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/96818536469.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/pevunujaxi.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/87139651959.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/17063163790.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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 11240 bytes
SHA-256: 2516a653bab1f25623dad6b0e994eb46c9abb7b86886e2136d72265b632fb4de
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 16564 bytes
SHA-256: bf2cc9f2e2015df24461d3b96771cdd0072e4c364988c6f77f06817ae1ae4f39

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