Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f77a49e5eba7e6…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 06:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d516c6f2743217f53e2073f3caec67f SHA-1: cfb412a2b904e023d469efbf789a0c2f6fc41a73 SHA-256: 39f77a49e5eba7e6093fbe113fd503c9b2fde14e14fa18d7e0fb9bc4956c0327
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.singaporemedicalclinic.com/ckfinder/userfiles/files/2881835450.pdf In PDF document text
    • http://iaestedresden.de/userfiles/file/saforoke.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda870b32d6---8840503058.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/54770329306.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xedakotaginugigegelif.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1676eb0b17---notowemapuwi.pdfIn PDF document text
    • http://keramann.ru/uploads/files/89072313177.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fda3bad49326c735146d183ec2264802/jowogibekipuzenonasuwar.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/lezagepibo.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/1668851197.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88004464586.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b3dcb76---78116461733.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/hg55qg6bce2mkmulfr1ktuc9pa/jeguledux.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202108290827105122.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/581228649421625804463.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/g4q7ildomrk1k4jui3d0mdcaqg/faledig.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070830d616a4---golawap.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f9548934---46205632162.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3eae53905bc51ba906c930fcf2377d37/71049944154.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210828070907169.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef915a58a7---jasudabibogonujap.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/94cu3frpcuaimkoppd3jpa9ht3/83301477186.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/webuzoruvomivakefebi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/klilmkrqj71g4amok7nbm0b7mi/mebowogezojal.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0149d3acd5---52410871770.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/19930033007.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/27612199455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=template+lesson+plan+wordPDF 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_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10508 bytes
SHA-256: ed772c6521a63d29390fffb9b7b0b353a73b8c245f7c6b11996c428bcb08b565
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 17028 bytes
SHA-256: ea3478ef7a78ce5f91868a316b4eb51b5736500267a704a31954196f60616763
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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