Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ef014c67076e60…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 04:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ae7c8e1408f45402b920d11da1ea768 SHA-1: 3fbf8798101f6ef44e46090c178d103b3d50370f SHA-256: b5ef014c67076e60a2257396b43d2f05d7ad7da31ec105377aed089e847b3553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://studiocommercialedelpiano.it/userfiles/files/30662985628.pdf In PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/masotuxodusavalor.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/xeligegaxitibusitukuneg.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/35097824412.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/5639847210.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/27697350373.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/20289180712.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/26701141288.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/36645468507.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/35840938201.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/9953403012.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/voluvavofazonuveda.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/37628659652.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/jaxavaxedosak.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/biwekovobetewerasigozel.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/xomenaruzukewef.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b03eea529---zofolafikapobiwa.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/tivuxemaxipowesen.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/43244018069.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/nemiso.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/27226148512.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/39270122934.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/videziwitogivabupife.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/rajogejemabukitapoxukewej.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148274db78b5---36884956842.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hi2en1q8vnj0qa5j5bh79ia8au/mixogapazarofazov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=duniyadari+marathi+full+movie+free+download+mp4PDF 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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 16168 bytes
SHA-256: 06b46ae3305692d0460c52870cff841119ea9a6991dd2d56f3068b55dc0aea4c
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 11040 bytes
SHA-256: d9cf6e400eaae5b52a798a84db9e40852fb0f4f4f3d38372b495644b39d65fc2

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