Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c8bd8e28cd5a39…

MALICIOUS

PDF

84.2 KB Created: 2021-08-29 20:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29fba633de0bb08ab27622bdfc0fd0d0 SHA-1: 12064e2531d88b99b12c67c306e2528e6a73a222 SHA-256: d5c8bd8e28cd5a3901138bbde30eb8c5775cc5dbf4b19a00cb24499d22b306bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to exploit PDF vulnerabilities or host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/22dddb4a86e7f454b332e64a4d3c6268/pizugojitejumovapevo.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/78707380075.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a5aaaad8680da2887e285b03b7558ba7/29589591472.pdfIn PDF document text
    • http://renault-service.com/userfiles/25362548343.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xekibonatuletibar.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210829190124.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d0f324f0---jedibavatederodoba.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/2631982536.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/84914970497.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/525b4eb66d5e3c95fc1d76f1891c6f92/telej.pdfIn PDF document text
    • http://ruihuitax.com/files/file/5318854840.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/xogidojapemeruvavunuga.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/6408367954.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f9f10046---66576463989.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210620005749_o9wrce.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e586cd1469---77722439391.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fee5b1cbc---23645942443.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/40606996149.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/84277506419.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086862d00e10---98794527731.pdfIn PDF document text
    • https://brakos.it/file/42193913011.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/kinabed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+woman+warrior+chapter+2+pdfPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/33351196915.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_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 10840 bytes
SHA-256: 0319f5de50cab2cc6b630cfea38603021bab16c1659429dc64e1898024bbdca4
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 17260 bytes
SHA-256: 4a18afe0c85ef0e275dd2ebd3ea0b0db3525cdece05ef25283690abe0ce92f61
font_02_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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