Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95c6050cbaa01e0…

MALICIOUS

PDF

101.3 KB Created: 2021-06-26 14:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4457be0835c2c86263a096a1084c50c SHA-1: f89935c4385b856cc43562ab5a1a1e3281674a54 SHA-256: e95c6050cbaa01e08b329aa25b00a166587fa81a9794d701f730f4a37869fe48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://cructi.ru/uplcv?utm_term=fifty+shades+of+grey+2015+full+movie+download+filmywap PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6b7ad3a789202a0f4c50d74c9aa9c909/midizuwurujejozuzi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/bd9fc5a4e5af6059e84aa8ff3cf6b23b/80439387668.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043021520066.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2ddc59cc---fawesigigevelejapepex.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7a14bhlom4ts3mr5q4vtfo1gu6/21575745399.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/57318661887.pdfIn PDF document text
    • http://mosjob.ru/images/file/fuvalapujonasupo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e9fc8f89---salukuzudobidewegebesetu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c14a4b90e190cb7dbc916a7f12687d4d/13821536874.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094204ec32c6---rififabo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090721fc4000---6713309387.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7216a57ff5---tokabanotog.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/40544554207.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8941caf8---28382274311.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/35065664402.pdfIn PDF document text
    • http://rilta.net/userfiles/files/65808421964.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/2755898120.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/501da829c9c5f01bc89eae722a929a64/najeganigopetonanejafum.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160991d0031939---84824131341.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/82915904807.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084533b14010---foroguzisig.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9a44856ca2b31af89d59b9b5fd472afc/61582552557.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 16280 bytes
SHA-256: d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515
font_01_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 18408 bytes
SHA-256: 288a0e634a98412eef9365126fa4de735b5c53902802ff5845e42f80caf23960
font_02_sfnt_off00014a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 11716 bytes
SHA-256: 26e95eb8d55e74417f99482b4418a574e5e6c31a2db8f98a667716c79094f16f
font_03_sfnt_off000165f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFF 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb

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