Malicious PDF — malware analysis report

Static analysis result for SHA-256 2218a4eb18d01b32…

MALICIOUS

PDF

73.1 KB Created: 2021-10-05 00:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 289d9575e4dd6c8c6debf31ed08ae37f SHA-1: 9f2a60d64994406f7b6160e266f64546da76ceec SHA-256: 2218a4eb18d01b32478b1dd06ff2cc210b52cb7c596aaf86147b010c958314a4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cafepiolho.com/uploads/assets/54164056367.pdf In PDF document text
    • http://pizzeriadevita.it/userfiles/files/80634223460.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-10-1/20211001162510391620.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2cdd01d5e65eb51283bf3470bd3592/jezekugenud.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/13258258546.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/72105984801.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/76592266802.pdfIn PDF document text
    • https://mcsfood.com/images/file/ruzazoravurikifo.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/pevuzutowunukip.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/73690466792.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edd47ca7b4---46280728209.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/27213073836.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140084b1e3ca---80243555827.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c153483a9e---55831383201.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/64923438696.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/68434027704.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/94807405056.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/vobinemu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdd769cf8---xidegijaba.pdfIn PDF document text
    • https://suzukihungyen.net/data/dulieu/files/23819671500.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af5cc0f59c---kidamevibazapovudefalew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+answer+to+a+division+problem+is+called+whatPDF 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_off0000ba86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA86 16636 bytes
SHA-256: d47458999565f8ae7aa3c52d59fd9d871052bd19711241a0889077d5f78c0554
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 11036 bytes
SHA-256: 906162a920823951de4eda1f1ea9215aaad8e2ff3d0d39137aff94b12190b45d

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