Malicious PDF — malware analysis report

Static analysis result for SHA-256 172d4261ac01da86…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 17:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1cf65177b5287d5ee6ae4a5db7956a3 SHA-1: cefa1e8388db49bf3996ea3639000921a93ffeb6 SHA-256: 172d4261ac01da86333940621dae3e1fba38c3437f2a6b4ffceedcfbb2a27cdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to phishing sites. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9077563---puxemusaxesajafufazo.pdf In PDF document text
    • https://northwestconvention.cz/data/files/giweraferafebor.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e9beb7110---wamumovusu.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/xitojim.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lezeg.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e47589ee---nazovesolu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6270e215c---10573565098.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf5c4e184---serugowujumewu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/kigawosutapa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdecc20414---78250595215.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/nisixezalobo.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/54514405491.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0f586bdd---87925170073.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c325118b10---bibem.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/92955084195.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/badirosogisezomor.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/52732209806.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2f6ktna1bt6hr7aj8heb5ot1da/zululajuwulexe.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f87b253652cf53f3cd33ad6c113fd0ef/86675526345.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117d96990878---32001502627.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210904170949.pdfIn PDF document text
    • http://dgkno.cn/upload/3514312173.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/80101796760.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/voxifok.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6cce98471---69058219531.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608533e437d2a---pofesawovufowalikude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=steel+magnolias+script+pdf+freePDF 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_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 18536 bytes
SHA-256: c5b44fb04537abeea52591624bbafba4a976bddaf3ce6a35b9ba5a2fa697a60f
font_01_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 11040 bytes
SHA-256: 0407b0e2ba3124ce6cefbe6d399061dc937ad901f8f19beb87d3b19528281168
font_02_sfnt_off00013ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1