Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f0a444c75400b7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 16:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 33da5b2b139ae2973afdeff98e9c08e7 SHA-1: 12d65ffbc7b42f71834e5a1d5c19bf6befea15a4 SHA-256: 20f0a444c75400b7526be5b84b61f6ab60d4e19248643443bd25455de6fd2af4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://malbreil.com/userfiles/file/98155908847.pdf In PDF document text
    • https://gegeny.hu/uploads/file/tidonedogifomufugero.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/nodol.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/toxemuretipugur.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/36098195871.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6cbdf5822e30c970465e06816c30c51/25841965816.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bea8795c5f---sewopironoz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de0142bb6e---21497149686.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/zukemixomesaw.pdfIn PDF document text
    • http://bakoca.hu/files/file/madezuvefopidibenet.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/lanalilezufisuju.pdfIn PDF document text
    • https://aayams.com/userfiles/file/wofofep.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/34962477121.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/91659201049.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a2b00f4b2544b80a28c27d4afb3f5b72/dazenilifuzodufes.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/wajupitider.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/tekelevazajijeda.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/vofalinawabasutufuxinej.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/tobonuxogiluwifagov.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/takerodonelimevosupekav.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/zofop.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/32726281757.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/88399698120.pdfIn PDF document text
    • http://geotersrl.it/file/telugigu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/828pkiuri52b3a7n4um1rtlo1r/fidepof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cheat+codes+for+let%27s+go+pikachuPDF 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_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 16896 bytes
SHA-256: 14e96cfe38bac0476a50bc92e89b075b2f2f24d6204ff27ecd3c406b5c007f31
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 11052 bytes
SHA-256: 643d3a376d6e6bb48b5abe7328abfc58f6bf971551137fae608fa301f498f9be

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