Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c435b686689a1a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 17:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2975ef2cc7327b38aeb73b2dab1d339e SHA-1: 5c811109ae6ab7a77c3fc16d97fe824982a3d481 SHA-256: e1c435b686689a1aca4ef554c45ebdc63f3cbdf84f604c98d436cdb3c34df716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/mexopipomukowi.pdf In PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4b689aedd54677dca112ca1a0ffc6fb9/22533682021.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878bec0c3b3---lejitaj.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/petuk.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/14011541270.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/kuraxipiputibogobakipo.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/jigiwevek.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/pelixamamutike.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/85084007534.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3aes5mefeps3uvkd9a04sascbp/77163763991.pdfIn PDF document text
    • https://rippa.pt/files/file/tuwefulitumuno.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kk5qv7mcdb4oldc7msomls4jio/rifulevijozavupela.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1643b59072---17713895213.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e8d3b2ca---67488458653.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/96461288982.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a42b2a2b---linanadisitadege.pdfIn PDF document text
    • https://projetovm.com/uploads/files/1411464257.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/34736148528.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710128c88ce---50739745156.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iqihgbp10srun1o9odh4nm4he3/19842234068.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/accb5b821e372a1132aac93bd5078f65/ravojowiv.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89793365ff---wupomibidobu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/ronezenizasiduvefebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=calibration+of+thermometer+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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10764 bytes
SHA-256: 186ff32fa13f135d995b84de4ecdbef4f0a54243772fd019ab5a22717b0c7bad
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17624 bytes
SHA-256: 0a13fe16524db9f605617330d938eff4fbc7adac8cf7ec4bbe630da83202548d