Malicious PDF — malware analysis report

Static analysis result for SHA-256 13419e04bab410a1…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 17:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d94396a1d7103a8d6227c8e6376d81f2 SHA-1: 28cbbfae5ef4124386f1cd22f37ff0aadd9ff7d3 SHA-256: 13419e04bab410a121420e6488a41b944b2229f46ae271b5beeca2ad4d7f694b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing or tech-support scam by prompting the user to call a phone number. It contains embedded JavaScript and numerous links to potentially compromised or disposable hosting, suggesting it may be used to deliver a second-stage payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://guanlai.tw/uploads/files/202109150845047852.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613239756bf82---35006994595.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wumozanaxujurige.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/62227716443.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e5ace83d51e4d5a6b1f55ecda579e2b5/508988442.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nonovefejimizigazowol.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/85409369513.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909003029.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/82920007438.pdfIn PDF document text
    • https://aashianarealty.com/file/lulirobejemewodulo.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109010720197119942jssgssu1p4t.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/44114564670.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/762c7efb59b35efe432336b8815dc63f/84476451587.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/xititipenariwu.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/42536489923.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/worijiduvekevezowavadu.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/bupixomoxividorile.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bubowakigorelumisofuju.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/26580091010.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/linebipotebizulawova.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fipamalisudigud.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/67665711765.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/40906457771.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/44139916289.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/056376268563ebc9a4ea3311d1ccce5d/29576891561.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/kisexiziwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+apps+on+samsung+phonePDF 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_off0000ba38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA38 15864 bytes
SHA-256: d7172f655b9541692fabbd7eb1d1586c5ae691999a9719a38528eda0b14a8607
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10824 bytes
SHA-256: 1ad9993528cc85e1abd8b6df0cc3c877b7bed4d11b72e0eb0d5645110c892e5b

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