Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97b2b2066e7dd4…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 13:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34e84f2bb0e3ae59af5bbd4093bcb092 SHA-1: 0302ec34b3a00792342057787b4ee71672926fe7 SHA-256: 3a97b2b2066e7dd408cc19c162ac462b05092ee8de7e598923dadc6b671c05b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=mi+burrito+sabanero+partitura+pdf PDF link annotation
    • https://csn-alliance.com/data/files/gisetozewodaluvaja.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/af28067404441ecca61f64de5d1ad3a0/lojolojesaketajarog.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/jevetijobiwedapufim.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/tefipusipinewup.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608942c4468af---69249938015.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/budenulaja.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0886188bb7---82149938778.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o35q2ghrglkrrro26c8c57l1fi/178199799.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c769647e589eba75c5102a59077afffc/76665654014.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac6f0e533---72290006991.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c83f531f0e2ff30d36a569de086372b5/daweja.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085791ab59ae---najobikumajubopom.pdfIn PDF document text
    • https://isosklo.cz/uploads/gejorunuvovusafitumenul.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d3b3a7e8---82415737690.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1997fb4de4---51578955314.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/34861224903.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h2lefp1bjmp9dcb8427ran12u3/57544246334.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076929306c7d---fojomepakurowob.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a9f90dad17391cd6e95629a513ccc3a7/89153949649.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0d63c0f8e7a8eef2fb261b77f29691cb/gurisiwifidusofa.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/31482841128.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/mopolunirokesubalape.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/xigosiwefelalapete.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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 16852 bytes
SHA-256: 08678108034da2e048278f24940f174be1b149ef8a868b47dc3e0dff3f9bd43d
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 10680 bytes
SHA-256: ebcd80e2cd3fdb4c89d365a01fc2a9001002b97f05d528b7def7dfd726a24038

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