Malicious PDF — malware analysis report

Static analysis result for SHA-256 586a450fc7f5f22f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-17 20:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 557765cdbc0da6a2eb8875115e11ed1e SHA-1: 47bd67588d78117954fa85d124fa407e162d20e5 SHA-256: 586a450fc7f5f22f06d93614f33155e1fdc9baaab907dfad8f72f94ee8998680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or redirection scheme. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://feng-shuiworld.com/userfiles/file/finezabegusunow.pdf In PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/16980830495.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/87191f2861a36aa09ef673ce06f9549c/ratigekilitaxo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/16472501087.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bqf0g9digvhmcm5nbbapb6s2b9/rejumexomavovexiju.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/miwuniwomox.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b76937f00b042ca517d8a7d6a5f77747/mijud.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/70493210982.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/452b369cb6547c051b5d8d7b720f06a1/57902741426.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aec34db69---75352336532.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/kigasogesarururexemoganiw.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160821bb6d83de---41756353954.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6941742aa---wuxejofanumi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0tfimbqe4g2vju3fpnfuvvh3fq/95074010504.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/povuzupeze.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/29398146851.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/mijaduvifozito.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/45614728450.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb83666cb7---35051914895.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/gufujakokare.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/t16dnk0hb7hranvh8lk2otd3aa/76810839567.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/78332998639.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/9506326493.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/psfqmmk87gun10c218ahuquvip/53457576542.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/09d7b9a5bb78cd08bba42cf62159a2ee/jarexerup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=amc+problems+and+solutionsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3c370c1a9ca4ba200f2de8a0873aaf9c/gexosopubutegurew.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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17572 bytes
SHA-256: 1ca6372eeb8be891659e7fef9578b846da4954cb2afe305f41b5785c12cda454
font_01_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 10896 bytes
SHA-256: 37b54fcd9a75831ddbdc4b2b21f13d4521ae622cc9062a5f0e1f881f14dd5d4e
font_02_sfnt_off00013937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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