Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284a2b1e6bc56b8…

MALICIOUS

PDF

83.7 KB Created: 2021-07-22 07:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd2ea5f36ee0518a94f5d5251817444f SHA-1: 71fde7d90b6f0cbeec86ca5f57661eb326a9151b SHA-256: 4284a2b1e6bc56b83f8b16dc268d3675cb78d10681f52318986970a1678c353b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/o3fag63odcud42asgte4ehq293/pimibebawesawomoniluzevob.pdf In PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wonazavevenanazi.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/7677012656.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/17620928730.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/68085316868.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/2655791795.pdfIn PDF document text
    • https://dineflon.com//files/daxivavetomavunolorako.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/21115841403.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a924c0af0892ffbe036033a00d0ba5d3/lupabugiba.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/kajowusiguwokiwuw.pdfIn PDF document text
    • https://activepymes.com/pub/file/kejoteniti.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98290c214aa1989ec8cd85bc49906542/worapanifuguxavegelaje.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/vepimatemovunapilofaresel.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/kabidakisidegibe.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/39772500877.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/gaxujeluzud.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a7f05269b---kupifo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d281c7c2---45946165668.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98597475210.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/36037640325.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/tupowatewej.pdfIn PDF document text
    • http://tayles.com/uploaded/verolulegejovulexaxow.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/50652795051.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5948eb7b4e---13423017724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cell+size+is+limited+by+surface+area+worksheet+answer+keyPDF 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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 16764 bytes
SHA-256: f61b741689cfb0d8cf1f8eda422b42908ac35e5e95add7966fc4b8def71c6ec9
font_01_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 11364 bytes
SHA-256: fc62aebf5933525d598c424d446519173621538e66fbde18937db93f37c69cf2