Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21128bcc774e70b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 03:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c287ac7d51ad357cef6ad513f154d78a SHA-1: 10ab8e908daabfcfacca3f75e601fd19f3700617 SHA-256: f21128bcc774e70b37f7ab2d6edbb41ce012c3aec14b57d8e68833ef8378e91f
156 Risk Score

Malware Insights

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

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 websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://wakabaeducation.com/userfiles/file/88466731444.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161326a81b7f0a---xesuguzoxajujavugis.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135feb89b742---92168935569.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614901395dac5---36812548178.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/lilawezaludur.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/46094297070.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/pujelirevulakek.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/36501423662.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/mafedelinerus.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bamuzovixodo.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/wuduzudonunivisopazutu.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/22994012887.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/28385722738.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/muvitasimuvom.pdfIn PDF document text
    • http://njchemland.com/upload/files/37941265099.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/nijolilo.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/xinevobogomike.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413e169a141---lemokowefimi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4c6c0b5---xuzumimulativokixewowigap.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c56dd6887---lefabosixuloromak.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/96673257776.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/numuraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+android+tv+games+with+gamepadPDF 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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 11000 bytes
SHA-256: 62eb454abc51fd087e2ca0d0196c5e7b95669cd3cfd07d459ed99f920618608c
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 17048 bytes
SHA-256: a774fe9dad6690a9c2ecddf0113d0f374125599a0b0ac39125ac28f89eba42a2
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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