Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e5340bd3ca08cd…

MALICIOUS

PDF

93.6 KB Created: 2021-09-19 10:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7affc27f1f9686ea4b6e2356f90a885f SHA-1: efcf03c9128d836c3d31715d5e8ab54de77a8cab SHA-256: 77e5340bd3ca08cdae082d9f7e8e98b28c019016640a72badcdc9a8ba4309f17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs that may leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=law+and+order+season+15+torrent PDF link annotation
    • http://clinicaveterinariacittadivignola.com/userfiles/files/fekimejanizugaleboto.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/94791297678.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xavipevexixazubaxigizeza.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/43692234390.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/84997425310.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146e1abe4370---82158469141.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210911_235557_5316.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/69414988986.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456b83d5d15---patipinugominuxafupopulo.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nokemuwil.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/netunapubevijid.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421ef7611ed---32949086892.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/28532048678.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210904123253.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109161229407987.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfdc4ff95---9956932040.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/20945363237.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zimilatewuziwirelog.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/fijogaxux.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/najepukepun.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lph7hjh4vq3gcqb8ak01jgbgm5/tozawa.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/95852163632.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/92278404699.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_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10332 bytes
SHA-256: ba175a1e5f9722f777fbca2dbfa34c21e3664507ad1d6e0a0f1854d5af1309e1
font_01_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 18960 bytes
SHA-256: 2a3d13c7d715a10ba09e7c50048de1e973abc170374d6785f4e6da7f5a983f6c
font_02_sfnt_off0001506a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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