Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8b5bf8ae9aeede…

MALICIOUS

PDF

91.4 KB Created: 2021-08-01 03:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 20f98ae1a0f2851e320a5cad02e65cac SHA-1: 9f37a83d68d376415db843567fcce8bf7e62c947 SHA-256: dc8b5bf8ae9aeede8cccdfc9159cf1c3e97c28a9b05fdb990e5fc02c5f4cb7c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://macautemple.com/userfiles/file/8125005514.pdf In PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/nikukiso.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee532f03d1---xabarikusojo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddc2d293d9---kelexubumo.pdfIn PDF document text
    • https://yuktogel.com/contents//files/80875461408.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/matesedumadiputaxabut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a2cb89f60---tiponepa.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/jikeperufojukawipiroxo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/67641373576.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503001013537141.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aa06b95ba4d7daca55c4a39d70cde769/fuboxoxujinigodot.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/91246260569.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/ribiv.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/mimarefisunoxore.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/fudevotumivagika.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160979157dcd96---25901071141.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/43968250832.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/12292597672.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/sibuwevazofevetisor.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/52a062653c76066c7ea2864e44d4ce23/jotanodavejit.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d5e310f72d28acb905f1affbf0e6dee1/xewivupuposefiwifixavu.pdfIn PDF document text
    • https://triosms.com/userfiles/file/97883533843.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/14602614294.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fa9588ff7---48938052048.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/xizuvifatepil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=angles+alternes+internes+et+correspondants+exercices+corrig%C3%A9sPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 19376 bytes
SHA-256: 14aab79ce634d89b3412389ce4505d26f39e055a59389344c5bfa9b2f9fb4f31
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
font_03_sfnt_off0001424c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424C 10928 bytes
SHA-256: 98919fb47ccfce55ae4b035e01d200e748489ebd9daf89e447e325620160e826

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