Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b96fa0d7f7426df…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d9319188c66c59d1e8a03df7659cd23 SHA-1: d9e958a8c93aa48fa954ddec6043da4f404a6aeb SHA-256: 4b96fa0d7f7426dfa1dd1eb841ce2087f24c1017ce13013151e4d76a7eb44c95
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by an ML classifier and contains numerous embedded links. Several of these links point to compromised WordPress upload directories, suggesting a tactic to disguise malicious content or redirect users to potentially harmful sites. The document's structure and the nature of the URLs indicate it functions as a link farm, likely for SEO poisoning or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afb842234---355433388.pdf In PDF document text
    • https://monyetmesum.com/contents//files/11328159045.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/lobolotalosibabitolere.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e2b3c265---vagevat.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29264614073.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/luvofegufavak.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/64ee91a14341117fae9708dc54e5ecf4/siwukuz.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/65736335610.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd3d40fed---palowokijufemubisam.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fuxusenopojudoja.pdfIn PDF document text
    • http://championsview.net/userimages/41967571962.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/sivobebinulexemijeme.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/84331182360.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/eq3fo2t7f1c9vubs4tfqda21ff/84648426106.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/joworegutonevatazujujol.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/sikamonavatuvudaguf.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/govejuji.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/mibavonodumimokas.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/parizonufefigaweraxutimaj.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/51818690416.pdfIn PDF document text
    • http://showdoimovel.com/files/files/68517696724.pdfIn PDF document text
    • https://media-get.com/userfiles/files/fazebodizediweji.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/juregigekesizuf.pdfIn PDF document text
    • https://schmitz.cz/res/file/90085329018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=divesoft+freedom+basic+nitrox+manualPDF 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_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 19924 bytes
SHA-256: 9acd73963a4314dd6b935f79b948c1a80e19411cba893400ac5d828c44d46004
font_01_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001492a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492A 11048 bytes
SHA-256: 239594672b7824aad82dd35cfd77c54d15879db78adad12b784f0ed912cf9e38

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