Malicious PDF — malware analysis report

Static analysis result for SHA-256 a042178901694bf7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 00:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 322c6be60a83423dc9e01c391b14ff87 SHA-1: 85e6d978e9dbdf66b75a5ab7defc70194d8a018c SHA-256: a042178901694bf7c68023ece69d7005d12f03690400b7a6e7ef9c0e50158ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a malicious intent to leverage link farms for distribution.

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://inwebjor.ru/uplcv?utm_term=derecho+individual+del+trabajo+pdf+peru PDF link annotation
    • http://anhuicrew.com/upload_fck/file/2021-6-23/20210623085956820574.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16096966214f23---45024114469.pdfIn PDF document text
    • https://luminex.pl/upload/file/gedeziripoxinepawozota.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dmajldfauo8m1qjraqpk2u4gb6/63750690021.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/85852869057.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/20695799197.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/23062083395.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ff351736---50643058150.pdfIn PDF document text
    • http://falerisztika.hu/tmp/fexekazexofudonuvolox.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/50039680707.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/ziporezuzeveterevibapo.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/bimipalo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210628000040.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caddf2605d9---zamalarivi.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/fogop.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/36829703617.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/75582324638.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161124a920a9c5---11281353467.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/rafunelajofa.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/3873710373.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a11ca2505265ce19c911de94c1dce868/vesuvujabonopaxupunesidet.pdfIn PDF document text
    • http://agama-rc.com/upload/files/xiwotekalij.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/51721264499.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/pukexopuwuso.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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 10988 bytes
SHA-256: 2ea432ca21f82feaacd2904bacc34123fc6e630f7b239c5fffb7ae58e8b920f4
font_01_sfnt_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16536 bytes
SHA-256: a680c9e48c5e71663c2981c690e0facc119d0b0c1dce5a5c4071f7b4c0ea13fc
font_02_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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