Malicious PDF — malware analysis report

Static analysis result for SHA-256 b199c56a3ec895d7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 10:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13b7743e97098a91f7651270c6131ca8 SHA-1: f717e8be748d9badff102b9f6ab7d4ce4cffd718 SHA-256: b199c56a3ec895d77bb5a31f4ce2d4c2d950c537b62eab30ff86babbc417231c
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a phishing lure, specifically a callback phishing attempt due to the 'SE_CALLBACK_LURE' firing. It also contains numerous links, some pointing to compromised CMS uploads and others to disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of external URIs and the callback lure strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://seattlebestteriyaki.com/uploads/files/99690622999.pdf In PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/pagulesiwotafiwujakonuf.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/wovigifiralulowobi.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/begoz.pdfIn PDF document text
    • https://banghenails.com/upload/file/lobefavizabujuf.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/33232241253.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/89833100588.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kenakowebularubexowagat.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/kavuvuvomubakusufezil.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/45036148012.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/38303860379.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/potibokosutetopez.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fesaze.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/makofenedeloxul.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/zidopixebiribexak.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d7992f54f6febdd2e3ce0ab5de7a46eb/13311922283.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/87758031779.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xoluruna.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613315dc0b46a---95146983212.pdfIn PDF document text
    • http://osayit.com/images/file/99378417433.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/vopilatebedadiwepir.pdfIn PDF document text
    • http://armanetti.com/images/66402173171.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f495fdb19c---bovizezuxozapibot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+v+download+for+android+apk+and+obbPDF 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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 17924 bytes
SHA-256: 332c2a403255411ee06c6c0c03de1b61eb8113cb9ec2a3958d5e27d6588d58b3
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 10612 bytes
SHA-256: 66f3fb9b5da6a42b77a1cdf76d2acf2d0e9a59398354f9082968288d3641a2a2

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