Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1e6668d52fed00…

MALICIOUS

PDF

122.5 KB Created: 2021-09-15 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b5ed20a4ac43ee38ea18240657e0a1c SHA-1: 5211e3be2b771df0933bd69239a22d5ed18a48ee SHA-256: 9d1e6668d52fed00687c0e922062a4f01194b7e4cdf869d864d06132331e91fd
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe7d6c5fc---siraralizeg.pdf In PDF document text
    • http://berbun.com/user_img/file/dunaredufaxisizisojofof.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/supukenazowexiso.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/47077015131.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d6s1pfknogbfnj5i961abnfvht/1958667461.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/54317655400.pdfIn PDF document text
    • https://bloc-immo.com/images/wavikewolovano.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/60896073255.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346823bcf15---74457060512.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/sumomofinifuniruv.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18f303dd6---mubajuvafujodamusoxuju.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/17628091009.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/41614949730.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zozawojovixenozagidorepa.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/varatanazis.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/mexulu.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/85458903206.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/fetoli.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/28063561509.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zuzoki.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/selob.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336efe3c5d9---podapovukuru.pdfIn PDF document text
    • http://enewind.com/pliki/file/84605007294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=michonne+walking+dead+last+episodePDF 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_off00017963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19175 19108 bytes
SHA-256: 07b93c78bc1ebbf2aead53152ceb68a48255c2bd5600792847989b364b7db160
font_02_sfnt_off0001c396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C396 10864 bytes
SHA-256: 701ff6bcd954bf18fb264e18cb71322077148daacea286a94d61c21d3c5fd62a

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