Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc5838d7a5cdc20…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 06:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6fca3d07dc7941840797b31e91ec961 SHA-1: dc73520943355a42d14bfc914b8041f91ef32bfc SHA-256: 4cc5838d7a5cdc20fdf14b87038c422e318717794cf3bbc8a823ef44da5bb5bb
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://unnatiwelfareorganization.com/ckfinder/userfiles/files/gixelaturow.pdf In PDF document text
    • http://sicompk.com/survey/userfiles/files/junizonodupuv.pdfIn PDF document text
    • http://nakatka.com/files/file/5465042058.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9804f4e90e15f26021862733a03f7ac0/vifolom.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xiwukiv.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/regasu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/35115353207.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c8fd4a6fc426280e2254c2c37d02ca2b/nubodadixa.pdfIn PDF document text
    • https://hgb.se/filer/file/40095290575.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/77693080165.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xexaravoporagopenin.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfdd927637---82763280136.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/fizigozen.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/99289210064.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/31494347491.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/tularitapatet.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/66805499927.pdfIn PDF document text
    • https://wineart.online/userfiles/file/21986058755.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/kifegarasajejivatoli.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/kozufanuxo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6424b343b7---rosorup.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/56723291164.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16093fa9554424---78561370888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=identifying+adjectives+worksheets+for+first+gradePDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 15204 bytes
SHA-256: f505543dd63bd74d576535bdcced21f95e791d8067806fde0cf440d936ff789d
font_02_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 11148 bytes
SHA-256: f861762325ab844ad15c09b9387f8f99c92cd852fe10989a238ef3e80d7ae7e6

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