Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40b4eb7d5b7e35…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 17:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bba159f8f46139617513fbf9e8dc50ef SHA-1: e5264f4e3f3f9619226db87952c50321780af8c5 SHA-256: ef40b4eb7d5b7e3505cfb08723ad893a9b9b34399423be8d40e5254c2f82be05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=fundamental+of+statistical+signal+processing+detection+theory+pdf PDF link annotation
    • http://ddaengshop.com/ckupload/files/nasorotiguxelatonadiwonu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/memumelojitoba.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/jekigojodonosojepukikizep.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/bolewobi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/digiwogomasufuvojokakinif.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/58686273899.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/5093956943.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/legajunew.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/47025404366.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/3198075612.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbab093ac8---nabamirali.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/wobanuretexix.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334e173d8a9---71977467819.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/buxesuga.pdfIn PDF document text
    • https://j26clean.com/upload/files/94367280502.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/73254126872.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/mubitix.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/tivutadotonakulu.pdfIn PDF document text
    • http://szm.hu/userfiles/file/46491324295.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/getarewagisoraji.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sibepudixuwanuziwabunofok.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347367a3ffb---36668926591.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901203112_2090933948.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613074b01091e---12498554435.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/tegazemidamig.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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 18188 bytes
SHA-256: c31c1df51908548f00192fe471a08c0566cd8733e282627197d7214b63a7048f
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 11256 bytes
SHA-256: 3eefcbc984c82df4ed3a35570a7f987d50b39ef887690270923b5fe63e00c2fc
font_02_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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