Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7d6585bf820ff…

MALICIOUS

PDF

98.0 KB Created: 2021-09-17 15:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4c1b611f6b4966c3108fd52c713bf97 SHA-1: 8f66105e78a507f4c6b90210595496b4281e8602 SHA-256: 84c7d6585bf820ff3b9a7af1adf6ecd1fc47c14e998594033c8c47448c84e3f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://falegnameriacastiglione.it/userfiles/files/39052042579.pdf In PDF document text
    • http://35ct1.com/images/ckImageFiles/files/36988781002.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/339207305.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/15336684060.pdfIn PDF document text
    • http://reylab.com/userfiles/file/repaxunetig.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nuxuwovulutoniwafiginu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613551ec7e6a8---xukijobepamoletirotejomax.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/84118460694.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210915161227_716951771.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/kever.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitipuwafuz.pdfIn PDF document text
    • https://petikdaun.com/contents/files/65918919191.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/mepejavube.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa0c93181---81748010576.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zitekobarivefibuzivasumux.pdfIn PDF document text
    • https://bdata.vn/upload/files/96799170192.pdfIn PDF document text
    • http://vning.net/filespath/files/20210909190935.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45284d60f---5005422665.pdfIn PDF document text
    • http://ccsl.asia/files/xeremodobape.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nibozaxed.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/ligawogebeno.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///88624314595.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161443b3ec3bd8---sorom.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/pureza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+rfs+real+flight+simulatorPDF 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_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10780 bytes
SHA-256: b98b9be305377b3152b500fe40b7d8c8ac35018bff3acbe8e041141d75a810cf
font_01_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 22228 bytes
SHA-256: 72ab9f14564e6df4f95bec3d09476de6aaea2f2d62607f461d9f2bc53c899f73
font_02_sfnt_off0001623b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1623B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1