Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bc596274c250f2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 15:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a334af88dd19f2275d7ac0ce8bd19f8 SHA-1: 7b84b4972f83d5ff58a07606f43ed60da48427f7 SHA-256: e3bc596274c250f20f3e5db5944b229a6b34ebb2de44217d962a238fe18a45ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL distribution are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://beverly.kopanramen.com/uploads/files/nomokonuk.pdf In PDF document text
    • https://czus-lukasa.sk/userfiles/file/25740259098.pdfIn PDF document text
    • http://hiniceshine.com/upload/jipabifedif.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/vagoniru.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320075121c4---kelulitipado.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613780e1eb8b3---45112524007.pdfIn PDF document text
    • https://eguiders.com/uploads/61307818743.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f4ecec7---82816837162.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd51b411af---69924459893.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vuliwisozajepazariraj.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/4087944004.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/91711658246.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/76211621370.pdfIn PDF document text
    • https://ms2oke.com/contents/files/11943052584.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jojudegamubajurubajolux.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161302df3d786d---zaxovatuzojiwos.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/619532d623cf8b2922191361caf8744d/74382832087.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/46444444714.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nalubejepiwikapu.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pijadinime.pdfIn PDF document text
    • http://devison-matras.com/upload/file/sizira.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/bepotonib.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/17841979753.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/32702687274.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/vokajudafiwufutoxesixufel.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/28268606808.pdfIn PDF document text
    • https://rajakedua.com/contents/files/80641861846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=new+pipe+androidPDF 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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 16048 bytes
SHA-256: ab648be628ac22fb2e574063ddb5c5df9093a57b97a8e99be919f9a440653bdc
font_01_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10136 bytes
SHA-256: b99ac90e9a2e3666aa7fa0940ecdcd90ffeaee547bd89b5b76c95fbc56589a9d

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