Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80084e7585d916c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 18:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9ea4a12a7c4376a729ddee7132d7e40 SHA-1: d41ed611361098650dc7e5ab0d1863b5745d9aa4 SHA-256: d80084e7585d916c2d4dbb709b0f75a4845cc728923129efe4aa3e71f904d9d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports its use in directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dermalab.pl/userfiles/file/16371968500.pdf In PDF document text
    • https://fanaf.org/article_ressources/file/91249897328.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/89622070214.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/eeb301207caa34bd3d0c470e51fa0628/23257864659.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8fb4a3fa---gemubakaresilig.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/85084331012.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/39041982105.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/l3pu1m4qofkm1kjfgtp9jlmvv2/25627889307.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ea18bddf---1005968760.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/magetasoxomosovelajer.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sowilegotubazurotubo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160818547763db---likiti.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ec13ff5a---rowasidunegudiwitaxevozi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210510182102124.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/21144662632.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xusiminefutamajud.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/92619979522.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3df0d7cd---memateni.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/60575197322.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d53cad29400d0f09aa64471c1ec9816e/84595264801.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d04af2a45---17807733191.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dd54c63a4bbc5f9c76ca11d06bb9c9fe/kofejeriguvexusuzaf.pdfIn PDF document text
    • https://actorconseil.com/files/file/duwesivapupajojebuzam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=formas+de+absorcion+de+nutrientes+en+las+plantas+pdfPDF 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_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 18744 bytes
SHA-256: 29da08cb38da81aeaa62b8a5b4d937f4e21179726c1ab9a9d6b9c2da733c0d9e
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 10996 bytes
SHA-256: 9d58638a1e5fbc5f7785c2da4fa4ee292b25fc2990c7f45f80798e040966026a

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