Malicious PDF — malware analysis report

Static analysis result for SHA-256 443fc8b0fe9c1f70…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 06:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cff9c1d881ccf419598bb5aa1fc740a SHA-1: 31a73b6ae630733d4fdc4ac92737c61e2b4a5f54 SHA-256: 443fc8b0fe9c1f70ec845cce69cad8f1490f8f09b94580c542f4fc0e82304a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious domains, disguised as information about survival retreats. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=dirt+cheap+survival+retreat+pdf PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613070d33b394---98200881192.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7402c5802ded36c703b569f7484ab2a/88745551403.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5518775643.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/julavifukokilexuso.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/60993610218.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/95673000852.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/63678616430.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/jikovetuvezepafugiguxof.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/xolativ.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/vizasejenoguwezegi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/tofibinikurupasajonum.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/55936892843.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f65972a3---78509379619.pdfIn PDF document text
    • http://labradory.pl/file/89961389649.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/63277658428.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/moviluvosubepasatumuse.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/267657262b9ba82e4d3f85df3e01f7b9/13066776046.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/b3r6id1m7bt1ltj0eri03ekcrc/xolinoluzaramuretefupawu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/67086028153.pdfIn PDF document text
    • http://immopolignano.lu/images/44768955445.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r62d5jhqc31v557dnabp3v31ea/59079244756.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/90943087083.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/5359071582.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28196426543.pdfIn PDF document text
    • 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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 10660 bytes
SHA-256: 0d02fcfe8638a827d17f13aa4464b7ee710d3aaa53b9a76d57e085b95d076996
font_01_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 17236 bytes
SHA-256: 9cb03be43024cdde7de5bb767309a43daf48d225caec2ecf4e4f262aac05b28d
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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