Malicious PDF — malware analysis report

Static analysis result for SHA-256 355b7bc21b927544…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 20:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c28cadeacd3fa48e9ffdb48ab34b0bfd SHA-1: 1dcda7cf32728f6374a40a434318ca73bb1f3364 SHA-256: 355b7bc21b92754434f95ca75f86a7e9349fbb3ebcc37e78c490f34253fe6672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the URLs and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614723f591519---damosagokuxovij.pdf In PDF document text
    • http://vividconcept.in/userfiles/file/10422949047.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/65971400930.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zirij.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefaxafabifili.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/vozopowuzidurazufuket.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zigarosawalet.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/136200037613fc847caa57.pdfIn PDF document text
    • http://jump360.co/upload/files/20210915143739.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9bba7d265bd7812cf2aa7cfd2d2dc20d/75394473416.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/xakobadazitufeki.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdaab58bff---91424599390.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/vopedobekiname.pdfIn PDF document text
    • http://salkim.com/userfiles/file/vinizolusoz.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zapozuzofuruma.pdfIn PDF document text
    • http://lejonhund.com/upload/xedusozidiwugobag.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/50855760948.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613607f2a19c1---43837826429.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/83400456439.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/5267008997.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/92615280981.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131783a1de2d---mumupekirafizopi.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/muwixoloji.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/77381688966.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kagop.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/vaxepetulikisubi.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/sivazowozitejokimekobed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=let+your+life+speak+chapter+2+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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 17064 bytes
SHA-256: 9733309b4d925a00801801f17cb8505ee3c2d65757c476f96968edefb2e02b50
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 10996 bytes
SHA-256: f82364c5e6429c6a58b63387fcdaf0bc4fe111a521b82a485c135caa80152f6c

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