Malicious PDF — malware analysis report

Static analysis result for SHA-256 87415743c9b9536b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 10:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fa8746813c94c2f9ac94c0a4d083b31 SHA-1: 4e247500a8b772b6a6fe3be9310132b6f1741f2e SHA-256: 87415743c9b9536bed6a7fccaa81978196162e42a3bd2d479c9cb4d44a01a24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427eea2e684---50193718797.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/71109831736.pdfIn PDF document text
    • https://servauto.fr/img/user/file/narunabofubuwedawif.pdfIn PDF document text
    • http://asja.ua/userfiles/file/burufawalazizikekuviviw.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5aec0d09b235c74b7f3e91424526ade4/70493180334.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/mopeto.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912234511.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/23398189925.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/xotirokitedexurorabugib.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/84700954150.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/10946355451.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xerijuzegevete.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/53786911717.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/musuba.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/181046098333917771868eb517486f9e/zaxux.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/nunujekofetajukibavi.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/89958155696.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xotubopakexemipoj.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/xexek.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/11107163906.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///volifoxejirenozonolojos.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81716356122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+data+from+dead+android+phonePDF 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_off0000c71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71A 17216 bytes
SHA-256: 8ceaa2950648a0852109ba54775f4c7b2c1d853a3e35e3a59c4c81227fefceb6
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10792 bytes
SHA-256: 6627c42b875a1f65be554ba727639d154bd926aab4f20434e02f0c9d81a826a7
font_02_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1