Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5945b2b171b9de…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 07:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88200d770f308c80d714a93473a4c740 SHA-1: b78f8f42057f85db2520e192ddcdd2853be7d429 SHA-256: 6a5945b2b171b9de270e219d9b903bbd078651551b7fb53f0223ca87abb1b0d7
164 Risk Score

Malware Insights

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

The PDF document contains numerous links to external files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc55a98d19---lojufixutowigem.pdf In PDF document text
    • http://zartmobilia.com/userfiles/file/20210527020616.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/vofudubaf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9hdilm9ib6m2bn8dh812g49qi4/sefixot.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/92470373910.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dalorej.pdfIn PDF document text
    • http://simonide.org/userfiles/file/37196278904.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52af00387---kokonatiduninojine.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078794150968---kojemamipamutixopi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f30329700---monuxobilareju.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f83602d99---48743846355.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vagidubowekijazapiz.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80775028c---92579688821.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fff43d73f---32926708890.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/55868522120.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c24b53cbda5636e4c6b31869b7d85ce2/pogulobemodosanowu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fatomokubolefopirisizulim.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae509c049c9---kuzozetep.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/20490149683.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3710642febb11102370b6750bcacb1de/56732942755.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b71e4852c---63411865112.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/abcb2c0aa176250ed6438a820d352e24/xudebowaronapabusofisi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/78044588236.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160af903fe9885---dewalubinar.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79a49202---vixetowabija.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/64471383796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fire+water+piping+specificationPDF 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_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 10672 bytes
SHA-256: add246fb2e600b50ccddc51d97d40fc8ec0573f96ad5bf5184157c0397fcf0a2
font_02_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 17740 bytes
SHA-256: f2db71b27abfb172bf80140fe3fbcd1d266b000377d6c231a86e4b7775b55ecd

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