Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f553b70628a46b2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 01:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a69c8452f99133cd088b4ac7b0973367 SHA-1: f309ba0ec8069f665a03da307e934486b9a1ff74 SHA-256: 9f553b70628a46b28f22e18ce531780fecac41730ed81125e0628eb4f0e32bae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final destination. The presence of numerous unknown URLs indicates a redirection chain likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lidiyageorgieva.com/ckfinder/userfiles/files/lipedisubisuxiputizumiba.pdf In PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/56784343840.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/22a2e887950bcf47f8fc1fcf889bcded/nenesuvurixotusipejitom.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/sulemasopeba.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/33197240277.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/68528830930.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b3a2faa937abdfa62d63576a154a2121/1966216487.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/58132762932.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/58176105148.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/30953880994.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/fukadimugaziwopuxamewuz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613264a791d37---90439950907.pdfIn PDF document text
    • https://birudongker.com/contents/files/90918103891.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/2835463855.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/91882122293.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vuxifavorebuzukelufinu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g6lbta9cp7len1sj1d9pn5qmh6/60408175306.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/pojubobokimomewog.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/71777517224.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1896501953c5b9d1a58227c914701e8b/40091065605.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1a22543b---zepojozovifalamotizikus.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lunud.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/61923823093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+ball+z+reunionsPDF 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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 10484 bytes
SHA-256: 0b9b482fe814e90e5b6910f4671310450843ed62acb1a42070d44aa4bf4215a1
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 20720 bytes
SHA-256: b883b23799ffe0360fdce16f889a14f7563720cba1b25d70164afd4218f93123