Malicious PDF — malware analysis report

Static analysis result for SHA-256 7844c3caeca1364e…

MALICIOUS

PDF

147.0 KB Created: 2021-06-30 17:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f0643585d779805a062a9cefcb787b3 SHA-1: 7dcf2fe04cdf0391d0e02846fde6aaee4c9a8abc SHA-256: 7844c3caeca1364ee1874bc7159436b28625dc94dca59875eb0cf2794ea64556
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload paths and disposable hosting suggests an effort to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://andrelandberg.com/userfiles/file/3053436097.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6f8edf89---xuwojuxezotubazevafeduk.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de65cacdf---8328155448.pdfIn PDF document text
    • http://fabtur.ru/upload/files/jopewetudovopuluzige.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/g9ovnj4bq09883odculvt05b0r/woxororilisojewusoxadezug.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/86577754560aaf8371c874.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6500cae605256b9f31a4219a1c6e60be/27242588970.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/38508570552.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee421e28bc---8886138683.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa502db00c8---dolukavijik.pdfIn PDF document text
    • https://tavio.ru/files/file/wowaxagurimopoge.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/bofalam.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091be7f50fdb---12970594709.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fe0d5f85---fidowomukota.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9a815831---93248572046.pdfIn PDF document text
    • https://doganagolosa.it/file/ginifimaminisegemar.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/tidisinafotukine.pdfIn PDF document text
    • https://fasaac.org/temp//files/43103048220.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/efb28a0abd000f55a148f69803a0579a/wixurevadaxemeginipitowem.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/10967842850.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/pafamije.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff1b13825---fuzotosusuwazabedenitexem.pdfIn PDF document text
    • https://immobilgold.com/file/lival.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/73bie3s7rkr2a0u6h0bflon7uf/5833591300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=opportunity+and+curiosity+roverPDF 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_off0001d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7D6 20508 bytes
SHA-256: b056e704605af3be855e7a56c76cd4ee6bb1e66ebc822ca7ac2cd087296763ac
font_01_sfnt_off00020b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B9A 10764 bytes
SHA-256: 7ada4fac42de2344b78b2d8fe06d42ff1383932970f2e78897021ef1ab61029e
font_02_sfnt_off0002249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2249A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1