Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0ab8d332e64e3f…

MALICIOUS

PDF

182.1 KB Created: 2021-06-30 22:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 24bf4ea3b970099b7b83039317fbd604 SHA-1: 905f762da5c78a06fea584d1b88ebbde54fda764 SHA-256: dc0ab8d332e64e3f677980205e04485d36a2b91727e91d3c937542116487e1d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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 https://catamma.ru/uplcv?utm_term=sentence+with+the+word+therefore PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6ef5b44019592da2dfdc3c734ef842b6/xuxuvonofezorolug.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b37cbdcf3a5b6fbf32ae3b950aebe49/sadoxafezupower.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fog178plcqgh0ssspbqos8bkm4/75502860459.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/talutiwekafezubeto.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7bca5b47---72409269881.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7c0jncm3kp6788hrrdq94h6hl3/77465910622.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/vnusald0ton7cmfv1t4nc5qmbi/80228179442.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210615_8809823AE3C7B458.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/vubovokug.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/13170317472.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084869c8121c---bigowovitenupibodanipa.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/16951410212.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/49378026639.pdfIn PDF document text
    • http://angkagenap.com/contents//files/joradu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160883500c7098---kexesusiwedo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/df7ce809f4d05d54566afa1d9468c633/75578708517.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/jawurakal.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/moxugovebozononebuzaf.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/eb4ad7b1a6b1ae325b62f3b5f18c738b/76389316753.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a4a6107---pokazuwetipakotosorusewor.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/ruzegepunifimevomog.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bd5f98fce9ff7961752f0ac9653e7da0/lurivirovaxodate.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a3cf778d31673cb17f1a9e9bf20e8900/29398576901.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1a8e22d1---22093064130.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/54269981365.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/be4hrhhrmgr466fj2o39aleld4/14018172367.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000253a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253A8 10360 bytes
SHA-256: db5747eb962786b7b428c167ca014b7091d527fc647da2ddb6b8534648d6f9ab
font_01_sfnt_off00026b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B0B 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
font_02_sfnt_off0002829f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2829F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00029ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29AB1 17908 bytes
SHA-256: a9abe5cf724cb71dc10842481f414a57959a294a5bbdef586030336744da9ab3

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