Malicious PDF — malware analysis report

Static analysis result for SHA-256 6003522b18b9b759…

MALICIOUS

PDF

95.6 KB Created: 2021-08-20 02:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8196beaa477f586358dbee02d4c62410 SHA-1: d03ea18f0b6148da320756f73575b564f529702d SHA-256: 6003522b18b9b759f56f3a96d2ccfa354e9cdf1c2566a45fc81341b6a85af704
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised websites or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oniceh.ru/uplcv?utm_term=wall+street+and+the+bolshevik+revolution+t%C3%BCrk%C3%A7e+pdf PDF link annotation
    • http://nrgmedia.hu/files/file/maduxu.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/salogidaxalof.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33ff0e9f1---zuduwo.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210716005503.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/99892921867.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ce240a88e---92440502754.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jelubebemimesodepotol.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f63419ff9---forexapurenipatitorovegu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/58470765282.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/jejuridolitokuvilikela.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kazun.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d66cfe13364---xisanaletokejiluzazotili.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/98869601545.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/rodelumogotuv.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f2b81ca1---93629284000.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/58960352222.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/godasadobubuxulomapoveg.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108191751301674.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8qiofsr9egtkchac3qafmtad82/18506873842.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3fe674ac3e464c486097b17640e12d1d/58366926881.pdfIn PDF document text
    • https://agatanorek.com/files/file/63683553443.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/lokomaxezug.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/11372347893.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-23/20210723162448887175.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c156500587272fa2491864f7299cff16/83954129708.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_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 11376 bytes
SHA-256: ce76462d531f868c1b0215d8ec0dce72f3b39312680f2e185debb73917d08003
font_02_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 18412 bytes
SHA-256: 014597139a432c10d50cb8c3e5ea2f0a0416633ea72ad243232739ee794f1fd3

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