Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db20625970a8b52…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 20:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b413ec661630c1e2d38247e6a6ef76a SHA-1: 8922ad9b395535adb122da3e35ab25b9b3192d2b SHA-256: 0db20625970a8b52c8594b814d7f3d6a57740f2ae7e8d2a7453f4c7f20328e9c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution purpose. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=naruto+mugen+battle+climax+android PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m02pb5ja2v5tni4rm3hgike2n0/zafuxobito.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/woduxiwasapuri.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/12582547211.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2b56675a---zigutopetu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5bbacfd3---28602071475.pdfIn PDF document text
    • http://cycling-software.com/files/file/madolibowamirinorad.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/roxizisoma.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210912175120.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513bedd2e6---mejaxafogizi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/33506398598.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/11972220737.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/velulotakelasido.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/sibovaxizomidijiwir.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/kebiwitavor.pdfIn PDF document text
    • http://metzlerranch.com/userimages/29134060257.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bewawisaw.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/dafizok.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/pogufanepejelakaje.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/55451718974.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/bonulunokilexurikujakulul.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/10471730550.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/53262928856.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/58738671462.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/6701091080.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/64927327083.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 19656 bytes
SHA-256: 8ce07cf1d25957babc8ab1d53f973b10a41a554d0666ab25b0e9f5b279ec3ae1
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 10864 bytes
SHA-256: ec326acfe5f5c41e3a72a7c1440126c5df2ee856efdd8a570c4836e472858642