Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fdf13a550d7173…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 01:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfd51de1ee6c31be5d32a4b18b023c85 SHA-1: aebf76c33b00026c5d45f4bda74b6f9560d5c404 SHA-256: e7fdf13a550d717307e9ae7b1b9696db560153f971214279b2e62885ad3f4daf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be redirecting users to external malicious content, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rem-proekt.com/f/file/tedid.pdf In PDF document text
    • http://sarkar.ie/userfiles/file/32472217626.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wusegawezeb.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161387d615e871---17737233596.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/3243918893.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/52513328881.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a50690a0---nobexelotewukubi.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zexifozu.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/sidufaga.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/nuvobejavemalidav.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/14306513921.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/27609554042.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/93202028103.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/98004297146.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/9608058480.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904124946561542.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/12225587568.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08c6e13cb---pegarebitepupozafe.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/kosawatarunavivi.pdfIn PDF document text
    • https://inarsindbari.org/uploads/41861127425.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/10154739944.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/41572213386.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/xuzofofegividuwak.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/tujunex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=game+theory+definition+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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 10704 bytes
SHA-256: 88c4491fd35370f124b4740c417bd62c664f16c0c9197313fdfd5875120d8199
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 18088 bytes
SHA-256: 6aa66c482e70b53ed2fa5b71679f794a01e81cb222fbae5a0e9959c54ef718c5

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