Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c04d27e452f6ea9…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 08:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c00bc9d35ddaa4c674b2fa1c1420abb SHA-1: ea9b99e61c514433717348867369434b1c10a2b8 SHA-256: 6c04d27e452f6ea907fd57f5c09db9d4a71974dd635b0169d6fafc83641deda1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators confirms the document's primary function is to redirect users to external, potentially harmful, content.

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 https://cructi.ru/uplcv?utm_term=vipers+2008+full+movie+english PDF link annotation
    • http://www.dilipprabhavalkar.com/images/file/8890461796.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f81f8322f7d---sasopo.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/1882577604.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/nuviduf.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/gewene.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/sesazujit.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74719980066.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/511lmocd1nsqg6vd45m7gu4dvt/famukerodutu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa68aa0da85---konidadefa.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/42725931936.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7357c6525c83255e70c5b604c5380ef7/lekokoduto.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/46736447828.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/wuxidovijugejilokimiz.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/45758750467.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/48340930011.pdfIn PDF document text
    • http://furniture83.com/upload/files/37353552893.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/111503575941e2b8c8d326f5b625269c/46573014161.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c04fede5c9d---81821228733.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c58e33d6d---gulunoxemepufazusujugi.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/sibufenaxuwunipezuros.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/46122523565.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/wasige.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc202948a---pijur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a87a77d0---zezokomiwanik.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ff8eb57e---tipux.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/mukojumisozuladuwa.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_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 18144 bytes
SHA-256: a0c42c099b392ec29630d3bbee4abc56caf4607e8aadf4093b1211e6158e2a26
font_01_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 11132 bytes
SHA-256: 8eda2f81679a65b41dd4acc98d2a2e1e30e84f20105407adee888402745b28fb
font_02_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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