Malicious PDF — malware analysis report

Static analysis result for SHA-256 839780e51348349f…

MALICIOUS

PDF

87.6 KB Created: 2021-06-20 11:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 69f632128bfdfebe0ae96ce600be847e SHA-1: d8fb78809117185812039fdec098436d72b0d1e8 SHA-256: 839780e51348349f8e0d78cfd17688fed0a6fe74692dc27b0ef5d64ff0e11e6e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to trick users into downloading malicious content. The document body, though heavily corrupted, contains text related to downloading music, suggesting a lure for users searching for such content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mimpiindah2.com/contents//files/rikelasovexuzapavabezimu.pdf In PDF document text
    • https://haysalon.com/public_html/userfiles/file/61647876786.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/juxedeku.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021052504420451.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ca4c294c7f7a7576386554dfc588e698/19525170632.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c9ae16f248f1a251794290cc82308b42/73560907544.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f791c84b30d8c21a6d342259c7b93912/41949123880.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dp52abmo2nl4ark901tokqtvh2/bigatanus.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a8a2187202089527d652d0ab1b46f05f/wexiziranukotu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094928edfbb0---76056190692.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fuzebafinetuvosa.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210617141800_2114383693.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8cb8bf8e6---zibexibeg.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef09d8eee---vudetunevawebelumivi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/l2b6rooa0a0bejjharn7b500mo/87183740137.pdfIn PDF document text
    • https://faceless.me/userfiles/files/5969638846.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/32936953948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+lagu+dewa+19+full+album+stafabandPDF 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://scripts.sil.org/OFLIn 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_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 5568 bytes
SHA-256: 4526f13bbb9ed29439469580d1001d7da1afed6b3038a690c3da1647b8574d0c
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 12312 bytes
SHA-256: 1a73106bda1ad326d7a7f899d504e91e8b7cb55f1f7c365c9fafe4c3ca1fd5e2
font_02_sfnt_off00013adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 16340 bytes
SHA-256: 2086c14a429709360347e907d58c6555af8873d0937fdd89cc56f7ced1114365