Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d7f44431b1dbed…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ff559d9f49a88e6d3b489a45bdfbdac SHA-1: edd8a3f1805509c2c4a9daf2164b01f4b75de5e9 SHA-256: 99d7f44431b1dbedf1f99d0d271385aaaed4ddaee5c7ff35d63de563b68b4ecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mimpishio1bet.net/contents//files/ruzigodaboranikologanux.pdf In PDF document text
    • http://billsky.ee/files/file/29296792579.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/70809282837.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/korevuwuka.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd7234288---82261616180.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/45061335686.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/65159370576.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43259edb2---fotozuretegaginabezawe.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/50492063288.pdfIn PDF document text
    • https://rotherelectric.com/files/vonudijanemawavas.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/mowesajafujudekotasodosu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/goxidomefosedej.pdfIn PDF document text
    • http://chemicalengineers.ie/images/71298807254.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec468e887---84531624772.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/690763954.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/dexalerela.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbbe9d5547---buginexagexixepusawosarar.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813598e91c3---gebemoma.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b408c0cf96---nixodofarig.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/24023647219.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/telejexemipuzasewabisaku.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/zorifexaronetapirabefuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=transduction+in+bacteria+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_off0000b6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AB 10768 bytes
SHA-256: a882cc8fb8eb4385e1683fc87c6f926bfd96bb7691a9b3ae1c130863e0bfc27d
font_01_sfnt_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 14856 bytes
SHA-256: 08cc27a381d7e8158f3225e0030c20a90676750a044967649fd3ab1f19ce2237

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