Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf897a95a253e67…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 04:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3df72b20202229f48ebb2b03421ffb0d SHA-1: 67039304d9ef4f27664cd402ea3df9f7d1ccc985 SHA-256: adf897a95a253e6799ba494e949f7f99f912ed51c481e56605c7baf2bc1b065a
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files hosted on disposable domains. The presence of numerous external URIs and IP literal links strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archgeo-leszno.pl/uploads/userfiles/files/xonilixivo.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfe666e72---56463042750.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/83310024748.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/44007775274.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/xulido.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/wanofenakigizezer.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/17194248532.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161429eceae85c---77628799807.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7c4690e6---sotidufalamalibebaf.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/lusigovikufomutew.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/51396634414.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/tusowiwivopob.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/38519039954.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dunekila.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/5294426585.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d079ded566---28675736410.pdfIn PDF document text
    • http://checopharma.com/upload/files/sifoweloremadumedu.pdfIn PDF document text
    • http://warehousetraining.ie/images/sekogupogetometiti.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/60176630882.pdfPDF link annotation
    • http://aytekinpolatel.com/image/files/riwibobim.pdfIn PDF document text
    • http://hejia-ele.net/upload/60904337373.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/88871295673.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/54287411722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rude+words+that+start+with+rPDF 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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 10428 bytes
SHA-256: 81338ebe3d0912f400e4ca45929ba2464d3a33d82d13271023d7b9e912a441cd
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 17612 bytes
SHA-256: 4c24e0dd349a2e80aab390fd3d9da7ca8b8c6739d3c41803029c5a1306473ceb
font_02_sfnt_off00012bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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