Malicious PDF — malware analysis report

Static analysis result for SHA-256 2123daf04880c56e…

MALICIOUS

PDF

121.8 KB Created: 2021-08-09 23:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fff1ceee741cfcb87bc2f7db22b32f6 SHA-1: e21b479c103f6ecb3fd8ec63271dbacba64c56f0 SHA-256: 2123daf04880c56e46292c349d290422e1cd92d7e4641da137fac66f7e0a1c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting domains. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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 http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/tuvinugaxaserum.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/8e971131ca84c0365aa27df2e874cb73/pagakozopapejo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c073b92bf---zotog.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c28d0757d67087d995bb234afafaf7da/gojalufewudod.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/19146512990.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/3209731358.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb50f47c92---79796278740.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c071c206278---15149480577.pdfIn PDF document text
    • http://screen.by/images/file/bimupojite.pdfIn PDF document text
    • http://imoroz.by/upload/file/10847030214.pdfIn PDF document text
    • http://cocoal.com/uploads/file/boretizumofevujipedokose.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/wetexupefiji.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/31594779377.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9cc89f27---30340973440.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0204a5f70b---77143173169.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3006d60ee5---punifef.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6360c3f1---19796386441.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/medowilabuxafosodabun.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jurinadetadagonupozituno.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/opdu8nlmolvdu52jkrahkge6m2/masadeg.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d509de1a---lejekidilu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/61602441371.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e72fc55b6e804559cd65841aee9e1ced/64590568459.pdfIn PDF document text
    • http://aweibel.com/Photo/file/tetefodunuxalojok.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a8d1627a953bb8db9336b74cc1c9d144/kamap.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/wutarafesopere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=inequality+for+all+film+worksheetPDF 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_off000178fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FC 16964 bytes
SHA-256: 1768169d6ee1c6e0e61a5ce6243ff2c58b191ea4bc7a27bc33ddf52d22b242db
font_01_sfnt_off0001a50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD24 10968 bytes
SHA-256: 4d71e97608a0197ade2255b719356ac0fcb5e110106e4f6acfaac1af8d298d26

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