Malicious PDF — malware analysis report

Static analysis result for SHA-256 120b769a5bb70614…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42bac3f23988d4a714487132e464ba0d SHA-1: 72722a5327357ae12721e531c06fc6bfa0f6a810 SHA-256: 120b769a5bb7061491e1a0bb3224cd3b5798b89ad3263d1283d99d2b8efcac1d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16096a55ef2e02---80037923064.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3c146db5---toridisejob.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b8b6d7dd6e6a0434197606894c091a9e/33538872509.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5ddeb87a3550b4500a8902391e6f5a65/xavukewek.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070aec9475c6---jaxofiwol.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/vezumifosefuxaxaweseg.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/1itqto4qpdjm61t6pp54jkmdd3/fukuwowi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607166c6ddb67---toxitaruvubavi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/libolu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/78603469391.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/89270053552.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c22727ba---rexuburatarikugatomene.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/jewulunelozobopudutuparo.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/9832704055.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///52991239490.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s9ljsbpsbkf7dnqg1l2pbcdsdn/89479847072.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/24242292520.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08c31765ef---38845953626.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/37970214997.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/50900511947.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9f6310f62---vapiveregixonovawojisi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/69464986108.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/wemamozelidupuliwape.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/101e88019a97fac347427dea5615b44e/nometubajobamofoseke.pdfIn PDF document text
    • http://benetalent.com/upload/files/62716287678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bimco+charter+party+agreement+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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16276 bytes
SHA-256: 81bd9338a503332c9cea57d2860053be3067bcc1b3d6008aa0d6e5e41cbda41d
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 11020 bytes
SHA-256: f012cb449cfd4d68a709e27b0b60467e96e4101a34cd9bca97aef24db7b9e57c