Malicious PDF — malware analysis report

Static analysis result for SHA-256 c946ebe9fb7c1b59…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 04:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbfcf8c0798bb0c7533f28ee9c0dc67e SHA-1: 2321fc2dd5bd7708b20ac1ff6aa362a01216d2a5 SHA-256: c946ebe9fb7c1b59c92c2cd6912758beb0f70832029797814956b0c45f8a1549
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, which in turn host more PDFs. This suggests a multi-stage attack designed to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mueks9fp2ttmr0pgptm40gmrfs/xufuduvanopuf.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/gonagisavow.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f27fd15e23520a999993d34673ef0f3c/pudelidelawevubirewoja.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082052f3771b---83269906599.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qqkdabc8a3ib7bnpkb226jbmm6/42995930859.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/75138876532.pdfIn PDF document text
    • http://xenangheli.vn/public/files/tolobawaw.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/66a4427aebc7b3e60b39570cacf4ebf7/1134598777.pdfIn PDF document text
    • http://446888.top/userfiles/file/67720700938.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a998b942f6a---moguwolagetu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/93360917831.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/88289347847.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3590016792.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb360b565---7570140491.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/lokebefog.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/fozafakabenotop.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/305527d211a42b6ec2c192e607635f9e/silaruwujam.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/tg59j9k3sm50o0psskbgfhq4lt/koram.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fed4ca146aeee9b44b7f6d02a56e0ba3/87323700092.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994fdc4bd6c---katunuxatubuzibok.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160896fe00a38e---64238675656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=i+get+wheezy+at+nightPDF 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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 17172 bytes
SHA-256: 75ea567d49826c68fed7f5c3e336283da73e99612a643523a1ee77f0ee6be425
font_02_sfnt_off0001414f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414F 10164 bytes
SHA-256: 2a0437c8b3bcf22f70f1ba3ce758735308930d3233c5a7437c8d0425139817dc

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