Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a8e42c7b33b479…

MALICIOUS

PDF

75.2 KB Created: 2021-10-13 08:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00d18d9668ff9de69706aa5370264f33 SHA-1: 4635af37d12e85402906f3e0682dde42d0b7493f SHA-256: 09a8e42c7b33b47957aed3698be2faca890b21045db6be43636d739606a036ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=how+to+cook+turkey+legs+that+are+already+smoked PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16155f46ec093c---dupofogoduluxubupenupituz.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/etokevogevu.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/60541029436.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1616263a8012fa---33072326499.pdfIn PDF document text
    • https://tonitomov.com/picture/file/jepadunu.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jifizafajuvu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/wemajibe.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/92883135232.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9aa5b827f46ff628924805ba1d4a9f8b/24155999771.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/79050623150.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/45212215018.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/jadelasudurelitiwur.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/16861482059.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b427203cf1f4ad3239800ea5c254214d/41818838419.pdfIn PDF document text
    • http://teknis.it/userfiles/files/48967427947.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3ce63746---dotukapirij.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615e82fd270a5---37407936013.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0bbae9b6---94609611824.pdfIn PDF document text
    • https://tch.lu/files/files/raduzunik.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/nabegut.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/99895254119.pdfIn PDF document text
    • https://webmanagement.gizicsarda.ro/images/file/ruguwarobudebeno.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd31190e0f---vowadimosuxeb.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/2450540104.pdfIn PDF document text
    • http://patroha.hu/file/kulipevofumesodefotepuna.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_off0000bfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD6 11004 bytes
SHA-256: efacc3a61ac4d8590f3d269d12e412a07454e7a2e70b313e4ee416521447bdf3
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 17768 bytes
SHA-256: 80fb47d41c1860c6e0aca94bac047211a79f8a94d201346c710028feaa94f119

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