Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8cc51d1c63e0f9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 11:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02dfb3fa74aadfad2654e885d2240b0f SHA-1: 9cb7ada0bd83bb8fde79bcde8517789af260be8b SHA-256: 9a8cc51d1c63e0f9579bb3374d2b7eb0a9ffbeb14c1114ec7438f9d83e6d0d5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=worksheet+mean+median+mode+pdf PDF link annotation
    • http://spokoino.ru/i/upload/files/nofuduberobigokupewo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/1881312598.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/kifiduvowejanoraduperop.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e183bc0bd---81539383584.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/tanelutafujokisesojoziwaw.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d69644dd4d2---82976921491.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49a3053b2---36259747010.pdfIn PDF document text
    • http://wamer.org/userfiles/file/60179725978.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/14972284606.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/religasefajojapupufelak.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mod6a388r55rp3uqu6eiharp2u/xiditokexigolodat.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/10885660283.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/52428869385.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66f5c5aa2---pulidilitadaxeduk.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/71739943976.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/39lo8a7iu4h02otp7lp7f17es4/33061425618.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/jituzuxatedurabuxijof.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93081e4d8---72239836282.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/72122698884.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794f053a93a---patis.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m6vg1ia9e9n63104sqgfatlcs0/begipidorofat.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/33258711734.pdfIn PDF document text
    • http://eyetracking.pl/userfiles/file/vawojejosawa.pdfIn PDF document text
    • 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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 18620 bytes
SHA-256: bf815cc401c68096a35cfa7aa26c3f9d8438f29ea0e492701d751e1f71792646
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10800 bytes
SHA-256: e02b41f494c06de7eee523816e5c5414109533e44544d4b0efc51f24bbf88e6a
font_02_sfnt_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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