Malicious PDF — malware analysis report

Static analysis result for SHA-256 54faf31bf23c2f13…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 17:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b12b6faf66b7e665d9632625eed64bb SHA-1: 77fe7a8f352692b7ed6acde8bcc25a327776c218 SHA-256: 54faf31bf23c2f136c94cc984b0acc58228ec9b4345db38e70dd4ee38a36ced8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://opuspointpartner.com/ckfinder/userfiles/files/wetotifapekev.pdf In PDF document text
    • https://s-h.cc/uploads/files/202109110642495657.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8c563ddbbd809c1f2d8c945de0c1d6f/6565669162.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/kiginapetamo.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/60794346018.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/27076971563.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/71022535721.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc0fc8152---22924039124.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/xowibotewuwedo.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210906134759.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/71779179085.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7fdc8f4a---wezapurugum.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/mobolorafa.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/xekigebajevup.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/78374378924.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_010446.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/41651180856.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/bakidumejuzarobo.pdfIn PDF document text
    • https://negaratoto.com/contents/files/wopigawonotibosafavep.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16145794eae3d2---28004066944.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/17357637057.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dadc020ac908e0b41ceee1919c682d63/difokeseku.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/rewavurobosiroxiligajido.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/46705899673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+phone+auto+clickerPDF 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_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 17656 bytes
SHA-256: e354dad1c82e5c74f1d5564c3965ba6e862913d215b5e2e76adea3ce071583dd
font_01_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 10616 bytes
SHA-256: 1216398a476a437753629ad382b83074b6de2827f49406eff03d74f736133c41