Malicious PDF — malware analysis report

Static analysis result for SHA-256 629526d68eff2486…

MALICIOUS

PDF

111.5 KB Created: 2021-06-27 05:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23d526cc525d760b905e868467d382d1 SHA-1: 9cbe7360c40d1b90ecc62420f524cfa974d30411 SHA-256: 629526d68eff2486532d6d896a1ee885c0c8b77b418fe645ecc2d9e5401fe90e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://queure.ru/uplcv?utm_term=annual+exceedance+probability PDF link annotation
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160989fdbd50e1---86918711202.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/37902819175.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jvkgqp3lq2c9nhn0cfnmnh1u5p/sozawemidabepek.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b423b641ca6---79885375092.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/21385998675.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/58111737215.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/58696411750.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a7a31e75d1c98cd637e95a4a739f68f0/gopuboke.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c81a5528f---gusanebuvosone.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee25de42c6---retutetawixixixujefagesug.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b414d9cc683---nuvor.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07f6a3611---nokigoluxodulewa.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/24430003062.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca357aec461---3679828796.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xivilofuz.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a09cc84a78a---31083443679.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/44270750975.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/bokaferatunozasuwifafube.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kagekin.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/92411943172.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/bubizowarawep.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t29es39sdaodvh319spsfg3coi/pojolovipebisumafewale.pdfIn PDF document text
    • https://paperland.bg/uploads/file/83815807942.pdfIn PDF document text
    • http://ipceurope.com/assets/file/50909704051.pdfIn PDF document text
    • http://4bx.pl/public/file/ratotegugafutatanub.pdfIn PDF document text
    • 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_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 18768 bytes
SHA-256: 7542cc66608fec6b5e04dbb6fe048c83faf33a39b291c70d02b719c167c7975f
font_01_sfnt_off00018001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18001 10776 bytes
SHA-256: 6c12c34c29ce4f71f1ac01512b65352142d1684b7571cfaf3fa353db4684cb16
font_02_sfnt_off000198b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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