Malicious PDF — malware analysis report

Static analysis result for SHA-256 457a3be2062a87a0…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 00:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ab06f6928f625117793e4d39c67cf45 SHA-1: 89e5fc84f45e6d29b828518bcc6dbfd982a99faa SHA-256: 457a3be2062a87a0ac241757a817a8e0d0aaa77ff9a409902a4eaf9709b66edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=best+sports+betting+apps+for+android PDF link annotation
    • http://blccy.com/userfiles/files/34130966486.pdfIn PDF document text
    • https://produse-zilan.ro/files/nesaliropuso.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/terili.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210912_E1E58A5DE9ABA445.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/sizuvenerivosiwusuxo.pdfIn PDF document text
    • https://tsegypt.com/file/96093460460.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/taxumejidimokizudilubikot.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/70621526931.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/32434326572.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/8770700216132f89f0664b.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/35148047464.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nikowixikekamoni.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161350b6fa135d---kalojusedoziwite.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/luxufiweruriduxupux.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/59828543940.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/38842559758.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/66786015432.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/21ba5c285bca6fd6e4fe302eabf2bdc1/nifuwobutubil.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/12ace2eb09db623e1277e5bc7dbebc22/15978765315.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/sulazejulufuxisagofuleker.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109070202093691.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/tewezetekesixobafugeseg.pdfIn PDF document text
    • http://origo.ws/userfiles/file/65543385287.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/12690163738.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/60104404644.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10820 bytes
SHA-256: 4e17f2f6edf8211cc4b81d49f28dd6e9935375f516467f23cde0518522e5b252
font_01_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 18204 bytes
SHA-256: c242301a6b3d3585be172a6dae217f7aac5d25242036918b5386d1e44938ea75