Malicious PDF — malware analysis report

Static analysis result for SHA-256 e598d992062ad763…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d34304d702ed3091b62ed2d99311b48c SHA-1: 1d33247031b790866e0f8b3819f81b231a633b62 SHA-256: e598d992062ad763d5b62a7e8d5d759b06415f9df71ee8afb895de24bfefba9d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The presence of multiple unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://samarthanamparisara.org/apadmin/uploads/userfiles/files/gaporibila.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e94edc15e---46330366981.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/medunelixukemes.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/vukefedemumevu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a445190f8e180f3174941a13fd0c4cc0/12909077751.pdfIn PDF document text
    • https://laser123.com/geektic/files/48674898824.pdfIn PDF document text
    • http://rsentco.com/upload/file/95288502457.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141661c7979a---rasaxubelinuzozaxasuporem.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/41048931625.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/bixaxigewafixemivutoj.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fawakifugorixali.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/logedozugejekolabovekozo.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/65437612199.pdfIn PDF document text
    • http://etkenkalip.com/files/zosazez.pdfIn PDF document text
    • https://tarsiman.ee/files/file/69746772856.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/talajage.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/48315614836.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910182443.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/fukejitime.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4d57ef2a---nuzowug.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/4877472331.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f490b1b36a---87798200906.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/xobawexivop.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313189526b---rawafewaxoxefuvabesobix.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/tonazuxanebimima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+no+lag+apkPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 18256 bytes
SHA-256: 052bdefce10eb111e63cd7c3937466108763838bd47b2358d91c31a0350ae334
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10172 bytes
SHA-256: 7fe6104f331576b38c62a5c22e948c1e2efde82d9d917cef8cda409708c76b2e
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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