Malicious PDF — malware analysis report

Static analysis result for SHA-256 035cbe65dd60a389…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 21:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5b51013874009e9e3650bf942c0a4014 SHA-1: 4ed671081cc1eaea014766c0ff21f1d0df3242ff SHA-256: 035cbe65dd60a389544ac1aed5ed29115984f537a86dc57ba021aa093a86ac4d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/243420e96787c9fe60c1c9d1254a45d2/82342838297.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa5f58fff---luxifoxa.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/70132918890.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/70528637686.pdfIn PDF document text
    • http://sb-78.ru/files/file/xiwup.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a6451dfb74f01ebf5d2716becc795371/juviwokik.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/92701420811.pdfIn PDF document text
    • http://ahchala.com/img/file/zipijedixadusuvaretiguvu.pdfIn PDF document text
    • https://yasacompany.com/upload/files/46709304775.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/77900236971.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/19731295015.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wetujetanibod.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/86019393776.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66390bea5f---dajemek.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882dce403c9---balosolenapunenusipona.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219434599683.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/porufuxasosagenatajuviju.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/57859917642.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/meluw.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/17946194325.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/vgmh2ul006lh8bhibc9a77nuoh/15578285008.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/gemepepow.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/zumexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rapidex+english+speaking+book+urdu+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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 17876 bytes
SHA-256: 7b0a057d9ec4a18baf673fbf88d335e6f977aa96b96665c4215ee9f68949fd92
font_01_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 11160 bytes
SHA-256: aca09bec47736902172432c4d6ce9cabbbb237f89a343542e84d86cabdf05065
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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