Malicious PDF — malware analysis report

Static analysis result for SHA-256 2305d5c86d94036b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 07:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27c24b0c06835bab3cd73c06ee38d130 SHA-1: ce59c91e7db8228e31266e6b9a2fd225c7d106e4 SHA-256: 2305d5c86d94036b2304dd28fe19185f656823ac4a5e04c923f289460aeabe6c
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URI heuristics and link farm detections strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=studying+gif+funny PDF link annotation
    • http://architettogherardi.eu/userfiles/files/68124931569.pdfIn PDF document text
    • http://gespk.com/userfiles/file/55006928183.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mowozavoj.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed78621e2a---jivotirafixuwene.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/lupafovuwovivisagefuwixob.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/kuduz.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/81144260163.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/56856340169.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/venovepefuvikobagoloruwi.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jufodudujimiputefetosag.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/jedim.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/bexezotekosar.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wonadapuxejeken.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/20231776834.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613483d024b38---31808619175.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/matatexivujom.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a03baf7a256b9fb33b44a881d20772cc/tobugujafipupewo.pdfIn PDF document text
    • http://allycatering.com/userfiles/tofufolonigugapotu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/udhdl9jh3js07ra4s8ebuu8h5l/sakarajaxovufijigepese.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/zagawaxafulufumeretewo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/49b5590afd09f60566f0724a03a60baf/6102930130.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/foxemarijefove.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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 10088 bytes
SHA-256: 970f3cf77630df719aa317fc7a9f34251ba7907a68a8ccb09fb5d8e37e557270
font_01_sfnt_off0000ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 16632 bytes
SHA-256: 5138097f0db92ea8cb2e91b14282c4afabb570ba8333bdcbb1f1f4565f7b67ab

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