Malicious PDF — malware analysis report

Static analysis result for SHA-256 5895182e107f3e58…

MALICIOUS

PDF

99.0 KB Created: 2021-09-02 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4531ced2c1836e0087a885bc8ddb2ba SHA-1: 65f6c5de81f357276f5656a1d61df01ec62ed5f2 SHA-256: 5895182e107f3e58e2d5da8561315b80b8fef7d31de16e9153ed22f546fbfd06
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://old.arcnet.org.tw/ckfinder/userfiles/files/vujulevurigekegevini.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d76b144d5---57304003014.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/49314129733.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47f72de31---92394991068.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/e0rf1du7ktp9g378p9h5343vpe/55387315177.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/jiwebuboke.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d2c67bfbda96a3ab68810097fb17e3e4/41327702901.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/2200904505.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a722a35bfad---75811219069.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7caa91df3f---gewobuwugotovizatisoto.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/96639110058.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/je1l96h1plgr9k23cugn7bepm5/disuk.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/37679182807.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/60070768183.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/90352613587.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021081001075573499.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/90947387595.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/gisanaf.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sefbmp2iutqsht3p3mlqrnnbuh/lunofefojuruwareze.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e81dad2fb---96084171359.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/sodiz.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160794991c0eb4---lativa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=electronics+engineering+basics+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_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 20376 bytes
SHA-256: cd4e8676245a53845c8d430770e9ecf9b59eb16b736b578f644fa2bf6bd39276
font_01_sfnt_off00014d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16558 10920 bytes
SHA-256: bd0b7cc908b66e431cfba33334c4d302f94f17c4b5e418d7180a024f60f9ed00

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