Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a5586376c5489e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 14:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 558d9df8a95e9f88e7922debb2b60fb2 SHA-1: 4b035e58287e278a7553d17fb035ac709b0fb658 SHA-256: 19a5586376c5489e12730809e7926808c9bd7ed9d2f3fcaf233b107fee2a9e4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/86890204199.pdf In PDF document text
    • http://zoekidsworld.com/userfiles/file/36742785129.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vetowaderilodufafironus.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/8564004978.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ddfebc5fa---widal.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c253c1a9bb69392b9d5e350f2018a170/majekaravujijunow.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090803234588.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/93817352011.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/9364746802.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/sakatisade.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/puborirawenebam.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/19112767940.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138b63e24dee---zibumosevokunuxuguseved.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b5511f40---pobowixovopavi.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/gigenesefitapimimot.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/2191198722.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/26960543043.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/8133663949.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/suredugod.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/86377641903.pdfIn PDF document text
    • https://apra.pl/files/file/3120711823.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/dalotepadorimesa.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/7265828122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bus+simulator+16+download+apkPDF 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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10972 bytes
SHA-256: f858934e5ad4e9e224e0ef413fc0c424c97e1bfa1703185fce28c6fbc5592989
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17668 bytes
SHA-256: b56e5001c40cf998fc1dc4d4176996edc50b90845a68d2261ef77108e368033a