Malicious PDF — malware analysis report

Static analysis result for SHA-256 173ca6115014b0fd…

MALICIOUS

PDF

89.1 KB Created: 2021-07-08 06:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dad0d8fd4fe83531244619f219ccb8a2 SHA-1: 83b7aecef538ffd616632113fdd4a109cc76a9bc SHA-256: 173ca6115014b0fd8203938ce90e889b3f3470f009105c70b3645d1438f30ce0
156 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 disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=tyler+perry+biography+pdf PDF link annotation
    • http://liebherr-tr.com/userfiles/file/lorole.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/xuguk.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/65639942323.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/20d99565a3eb22329295c8b1f253a004/80016825890.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2622e99df2---57353369743.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lcgo5g84dimpp3dutcpb3d3kn1/dotojaboxuzujorud.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4beb0771---91264928364.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/forejudelugobifugidagezor.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/26318318281.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/nivurupaza.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba014c5bd0f---57635108213.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2c82db5e8437c8f3693717435df17ac7/38328269856.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/87633168010.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/133e7ace0488d6ffac6a545c58fd2ce1/kopejowiberaduw.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/36657801388.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812716b8531---lebajasemoromewewapa.pdfIn PDF document text
    • http://www.bandungmesin.com/file/losubesumizidi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f423e17340---bupapa.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5ed9c9297f64866cb602b84b538021b6/gitenavuxevazunuxisukipot.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2b8e694470f1a78cda417ef779e5df72/22996241929.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b8c69822187f5e57bcabab7577e436e0/wutanerafavawotogawavek.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dc33b89e6815c14a42727ce0fc9a56c3/polokiwudilovokobaluzorez.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/69952173899.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/75179515052.pdfIn PDF document text
    • http://billsky.ee/files/file/20007137733.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_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10624 bytes
SHA-256: 97b5960f213ed84e1509f2da2693695f84a585123038430d3007b6736c80770a
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 16872 bytes
SHA-256: 345536593a6f12dfa059a15f3fd9623e820fb4120c78cd656bae49132a8b1d6e