Malicious PDF — malware analysis report

Static analysis result for SHA-256 2196dde6cdc31d23…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 16:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a99df713e53d29d52cc1f4f67573969 SHA-1: a3ec716a9fa614f08c8456cf7815e008b5d770a7 SHA-256: 2196dde6cdc31d2369cf433ae1b1a1d0c5c241bc1d969f4b2ad1c57a9fbd693c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://unosms.us/userfiles/file/xadegakujap.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5535b9e0248cd5e5f44b7d4536aa6cd/73388722664.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd65f6661a---nefiselimu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d0ee5cde981885e5fd0aae8057455545/zorawu.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210806162828436264.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/munariparepilezoximax.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/mitebudijopezijazidesodix.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/r6ukqb2lta05oege95sfhrnig0/xukejuxekixatiwijapudetit.pdfIn PDF document text
    • https://blokhol.com/upload/files/66990270275.pdfIn PDF document text
    • http://wohntraumgmbh.at/vumokepilomozasof.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf948c5ba39---judiroluzezameguraf.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ccaa95c70---madirotogupurajipakisanav.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608970546a7bd---tepixosugubu.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108281654016518.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b79d58c8---tumelujajabaxosidopip.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59b63b23f---69439739542.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b6546265---jututogape.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770220432fc---tedolefijirususomorawupe.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/71374321725.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/14954830506.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/merejo.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/jopinokejusisigotewi.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/81706122313.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/46254940669.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/33597411428.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5af0c4d94---dozesaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=canning+tomatoes+for+beginnersPDF 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_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 18616 bytes
SHA-256: 8fb9ccc2c11644af3d94c1dea8d9b7418384347a7ca4d258844506ecc69b8f38
font_02_sfnt_off000149d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D0 10680 bytes
SHA-256: 438f8242f2bee64cb502a9f59529144573a73aaf6f697c8afc6e58cc3af73968

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