Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a43f96939e7d7c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 02:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: debdf86978453ca326a541156a0c9b88 SHA-1: 3c3e712e6ba9b1928c4bf304fcf71def1995f5d7 SHA-256: f0a43f96939e7d7c38970dc094f2f323241233cbad71f393ac644d1dff11d2a6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting it is used for phishing or distributing further malware. The presence of a callback lure heuristic also points towards a potential scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://srilangkapools.com/contents//files/getugeme.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a467348c53a---77679870914.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/28575019871.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/lokogeregariro.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/wixijetuwetisa.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f0853f0c3bba82ca966d4f0dc1627fc4/96504069468.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/71669968707.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082804140350.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/088c6f1b3266564d288123b1f4d55503/kukivix.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/82665578329.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/1872197543.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160790812d7934---zobewoxuxosetagose.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/fovukerugalirodinive.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/75763391107.pdfIn PDF document text
    • http://computerdoki.hu/user/file/49801908518.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eb4abab04---mogekotidupukabebo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/66932722755.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/marafe.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/115b5af7770f18c867e5d0063bb6a36d/tukipubimo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160839958587ae---kemekak.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/xuluvav.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/vifavudijokowebim.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f485f95300a15d7650cce89a174ee5ac/43243376950.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43a749649---kafigipikinenenusawag.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/04khl3j080c4k27vg94jif5upi/pakimedilozunisizipiwe.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e4c911462ce5aee8cfd9ca29361bb33/90678956224.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/8521519862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=semple+kneebone+algebraic+projective+geometry+pdfPDF 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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 14780 bytes
SHA-256: 69fc7e7a64ebab2808cb491d8db809df5c91f714405d66c296554ef85df5b96a
font_02_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 11412 bytes
SHA-256: 7506982cf55a3789dbefe639cec928a34cf574afe0aa325ce4e360aec1d0c0d8

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