Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eed8ded363d7cf…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 10:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5d2e568c3d5fa3fe4c42d4ec7f10686 SHA-1: 0ba85ac621843e4aa7ebf971ede71623ac753b9e SHA-256: d7eed8ded363d7cf22ec99f75682e33e2063caedee0601a6a255afeede736616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to trick users into downloading malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URL farm and the 'download button' heuristic suggest a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pmrs.ps/userfiles/file/98437298176.pdf In PDF document text
    • http://makesomenoise.hu/upload/file/xejuxadogunigosuzefotu.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/seditajuxoruvulone.pdfIn PDF document text
    • http://marymo.ru/uploads/files/66436476142.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/pujuzekarewug.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/61129512586.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/rixelufoso.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/lutidubujuduwedete.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/85874439089.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/57009901205.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c355fb1f80---76049247909.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwesixokarazoje.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/92221708176.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/51458040574.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/bekowaxozilenemasoronat.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/mojaxifojuw.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/jaseze.pdfIn PDF document text
    • http://fluorescent-training.com/file/siwawugil.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/darudigobosowof.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219131212224871.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135da34e4f29---57840358059.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51452d305---7848598258.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/mofena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=death+worm+apk+full+versionPDF 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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 10968 bytes
SHA-256: b5e252154b3acef36e2f7e35523a63c93f35b17865e036c00d67320f371ad8ae
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 20256 bytes
SHA-256: 6177f74addef6d2da4fc20117174dceb90670c292e26337e795c6bbed451da43
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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