Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe389a8d20c87da1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 21:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ed72fe10e1a5dc84ed1f3d70eff001e SHA-1: 78f4bf2b767d117009fdaff869766d21a7fbacd9 SHA-256: fe389a8d20c87da12d289fc1c1772c032d5b1b6871380dbc443b2d6b6a4915eb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links, some with UTM parameters, reinforces the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://mgc.to/sites//web/upload/files/berimilujopaw.pdf In PDF document text
    • http://vmkmsz.hu/userfiles/file/25679230455.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/34532266037.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/tiwukoko.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429052853198908.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6r35uaseb1iktgstt7hrabgu94/68842661928.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/miwijanirugimu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3e17024ed---86141989841.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/pevepe.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/zexefepumix.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/15246596097.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b98a1d6---tozebakipuzero.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085bec976419---vebirodukowomukuwe.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608132224867675.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0573ab6af9---baxikasowizamibamisixe.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/92743744250.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/nivunedilanezew.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c0824f247---kugelulezunitukak.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/wukararemofenumodufuwilur.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/148963510560d221ca009a9.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/564652aad3e7fe4608139d26dcbd8f0d/69101885497.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zamepubade.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3355a9de9c---logozivefarorimebolu.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/13539051803.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/wexurezavefifa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc97693da1---zakatemu.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/65321022383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=correcting+punctuation+worksheet+ks2PDF 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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 17988 bytes
SHA-256: f8d014b01d78b838d71f1e5f5735e6463ce590a3f101b983afa3d3ab460d1d21
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 11036 bytes
SHA-256: cfdeb787d43683199792c1c0d1ba0be4ceaf583396a9143be4768be54c13acfa
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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