Malicious PDF — malware analysis report

Static analysis result for SHA-256 362c5131dfd284c0…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 03:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 77f309db8626c8a9bc840d23be550f0a SHA-1: ebb38ac5109ef5577a8bd0db7bea7c1b39bf123b SHA-256: 362c5131dfd284c0218f6f4c3b1f50d9738421ce85f2a9911f727e9db50657b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b951930b008a192205698cdb26ead5bd/32040491804.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829e8fc0ba6---12757838523.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b4553a2b2eff5bc67800db7406cfbe3b/13084026182.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/83503668866.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/zisupalemu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab257094a24---renedoxaxesawejon.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/032a942730a17c0c89cb98f37e3042c2/22627673717.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xosadojoj.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/vufadoxodevogud.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-2/20210602185443242008.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7e751824fa---90029987181.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/37cbacfe48b6ee3fd22be9ac23eee208/wekumim.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dc1c0fcf---87536017667.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/93495332763.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d2nuqr1p01jknau56fh5rmfma0/9525130689.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/p2vk0q0j79rn2pqbflpu2o6ga6/kabenakuvorawusapewiv.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/573419c531f50948da4fac13947f919b/rewuvozobaka.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1aa7c068e---jifudejafupevo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c264ca253---levefinewefokoroweju.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/sudofatidedewoxe.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0e8a8e7cb366a04151a9604b41639504/tafegevewax.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/71280569219.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///64215928746.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/99678374857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+chest+exercises+sciencePDF 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_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16584 bytes
SHA-256: c99bd0c54caa350656fce677d69cbc14b1fdc3cdff03504b41c708fba09bc404
font_01_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 10156 bytes
SHA-256: 6d7855196dfa8d3e032f5615802468492ba75b80c24bfdbc1b897c6176a0894f