Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b17f51adb6c94b…

MALICIOUS

PDF

78.2 KB Created: 2021-08-18 08:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99fe769ac587d954aa499eee9071de67 SHA-1: 9e1f1302c2c194a376f506bc38d2e6525741edce SHA-256: a0b17f51adb6c94be4623ffeeaec51caf060cd20d65d2769ffd8c74b2ecc5c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=what+is+clec+llc
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13bb09ac116bcd21befdabd462d96c47/judevolulawawuwejemiwesuk.pdf
    • http://ottotech.center/userfiles/file/duwabokazefamebapujale.pdf
    • https://incoyun.com/calisma2/files/uploads/popelutazogegalinazovok.pdf
    • http://budaikepkeret.hu/uploads/file/nosafari.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160790946560a4---lafemipegewuvirunosibu.pdf
    • http://skrabl.pl/www/rpbd/fck/file/66844647671.pdf
    • http://agiusfuneraldirectors.com/files/file/nudorekipe.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af978a285---vudibirelabumixexosutebat.pdf
    • http://halmar.info/userfiles/file/kirogukevilogidutekag.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607484c8884da---3292178373.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce252110c---jarureripikulaxan.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/23348534593.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160971dd193d42---nenozimi.pdf
    • http://asupuro.com/upload/save_image/files/85001875467.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e7447776ec3c10886261cef654479685/14322832596.pdf
    • http://tunglamgarden.com/images/fck/file/19913299873.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b76c5ddb6b8229d2ef80f1f2739be9cd/xumidepeju.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f352612e---lasem.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741359a1258---lepivufixemamukege.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/onqc03s5m0rjgmkt6g42s3kr31/vasamufejazolekofux.pdf
    • http://abnicum.com/files/file/nejowoxomuja.pdf
    • http://nelly-design.ru/upload/files/32552054857.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8c70f482739b7f5a2fbd37887665261d/gazesow.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5o3j4enp6h2aeqpc1p6bem7pc6/26415950880.pdf
    • https://flomogroup.com/upload/files/nofexesokadovemomevebe.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a32dde9f609---venipamezurazeziso.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/16688716219.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00a.bin
904ed112cc2fbebc7f87d5c00304c9285efcfca628ee35619defb5bcd4eef79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16964 bytes
font_01_sfnt_off0000fc6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 16792 bytes
font_02_sfnt_off00011485.bin
f7242a283a2505670961feb777371752f5dde07dc70b565da36ec6491232c162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 9996 bytes

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