Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cef25bb7136daad…

MALICIOUS

PDF

152.0 KB Created: 2021-07-02 18:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f6ec8667a2d7d3c48b2ca317ea7cc006 SHA-1: 5c670c2cf052e1073001def1177d9fd69a43d70f SHA-256: 2cef25bb7136daadc8b3c83c812c08054b4ec0c77c9919ccfa589cb0ae43017a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farms indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vjugk4a885r3tbtf9hl2hvkua0/mixes.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b79171375022016d8d5e101d779e1ef4/60513488830.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/55658141161.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/79165c547165995b9d50153daa564fb5/43066104444.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f6b22ca6ef1ca38305099c1f80ae2d09/fofenenelapela.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609532dadc519---88621885327.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zarezujudivivumowew.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/ditarunonifika.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210621140346885.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7773c007f4---rawiwolatagafo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d6a756cebd16d097aee0e4c69a9b9608/gebumebu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pdsbsbua8lspo32t3n6fdp1jpj/11672894519.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/35380940432.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/nokusevudofepamazunuzaje.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088287190976---tunugisixujuxiloka.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/76585895184.pdfIn PDF document text
    • https://purefeeling8.com/data/file/67771638121.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5926c14fc5---mewolatimilegin.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4ae87e384dbf5430ef66a0fd225d8315/14805391154.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/78073595435.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/26691620480.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/1988961202.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/xovitovuxuso.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eff84d54---33482132783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=7th+grade+math+chapter+8+test+answersPDF 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_off0001eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEB5 10948 bytes
SHA-256: 667f124b16741996a3f928aab7027bdc121f89c0c4bf4c19578d7aaa324ec720
font_01_sfnt_off000207d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207D6 18312 bytes
SHA-256: c2db87311683476d2bdee3b8902cd807c63474520afe8cf9504dbe7db350d6f4
font_02_sfnt_off0002389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2389B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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