Malicious PDF — malware analysis report

Static analysis result for SHA-256 af65dc3374b1fb4e…

MALICIOUS

PDF

89.2 KB Created: 2021-08-01 04:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8693a6e5f21e0517f3f369cccce9fddb SHA-1: d903b4a6e7b44834e07ef2796f9119649c08f0db SHA-256: af65dc3374b1fb4ede5aa9f88cb65817410530a7ed584e876e835eacfa4864dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious or compromised web content, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cana.vn/uploads/userfiles/file/mivurodubikilexowupedasig.pdf In PDF document text
    • https://thokhoavietnam.com/upload/files/38176488205.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe44699b2c---naxowi.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/rijajasetuxujabu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fubevovavopolasigo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2a66f3c2---50459839799.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/11672046076.pdfIn PDF document text
    • https://medtek.vn/storage/file/14611886123.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/terilolipakexodogulilik.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3e1d63fff148c930cd7ed4a89a621435/rezosimunukamirexexe.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/muterureviwolizubuluj.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1778d7168b---gejominunalazijipib.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/pekoxirabatulune.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210723173633.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f08935afa---nuwaxuxusazewawulava.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/19281417449.pdfIn PDF document text
    • http://dd-eng.com/files/files/mupom.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/gapomasujugiliwajaforag.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac09f34c60234fed16405abf4e3048e6/bekepowaxidiregemusurevu.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f6b8829c8acbabe2be79b295f943b767/zirafafizagubokeras.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dobumupipulotized.pdfIn PDF document text
    • http://zuche0551.com/upload/file/91386694928.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f44f6c0e80c991fb74bc68832eac4fe1/43614190154.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/porofuvu.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/40276695435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sadako+and+the+thousand+paper+cranes+novel+study+pdfPDF 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_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 11072 bytes
SHA-256: ca7e016a8812e0e55b9b93db9a22a8ffd5baae773aaf93ef0d88ff0eb97fafc4
font_01_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 16980 bytes
SHA-256: aeddffb2b5591899b92e2a75e39d6d4eef5450ad33ffdfbc8293809b4456b35a

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