Malicious PDF — malware analysis report

Static analysis result for SHA-256 7090561a99ea4989…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 12:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47569c4af562ca57c19f3839e77115f8 SHA-1: 76b250b2610a77efef39749ffed8e5fe42188b10 SHA-256: 7090561a99ea49893dc28bf2405d3a86290a389e4f9903922979b5b2de1329c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the extensive use of external links suggests a redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=best+dual+sim+android+phones+2017 PDF link annotation
    • http://china-hold.com/UploadFile/file/20210914120328865.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/lurugokuwixejiboxujonug.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/69639196780.pdfIn PDF document text
    • http://p-energo.ru/content/file/kazametoxofepige.pdfIn PDF document text
    • https://izr.fr/files/wexereberamux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wuzisobo.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/10106479106.pdfIn PDF document text
    • https://pratham.one/file/19870607237.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/90537636661.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jasatok.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/62196993051.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109151759391765.pdfIn PDF document text
    • https://airxps.com/userfiles/files/todaga.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xelepaxutifubi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce5d737644---nifegovomezul.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161331d67572cd---11710605322.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/dovobate.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/951uobjheirh24e3ujb386tgi0/ralajiwon.pdfIn PDF document text
    • https://angkagenap.com/contents/files/64663656439.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd498c6ba---21046643086.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/54235210414.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b8d0a23b---pirotajoti.pdfIn PDF document text
    • https://tarsiman.ee/files/file/dadamomigolu.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/62484915215.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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 11152 bytes
SHA-256: 67f3d804a91a5bfce215fab5d58704175a5c444e8e4f9f488acfdf275209231f
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 17676 bytes
SHA-256: d5bd1dcf0b9b4bcbc165510409d477e0cc16331efb9cee3a67f2478000845c75

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