Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbeecb1c469fda0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 01:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad543a162ea74596f7b3ac3143e89ee3 SHA-1: 851a04d31050cb22eb78da549072b0a499f34200 SHA-256: 9cbeecb1c469fda0b5c0b7c3d78402d55d7cfe2ba152f8cb325d13480c02a326
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised websites points to an attack pattern focused on redirecting users to malicious content.

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 http://odessawa.com/userfiles/file/5073316774.pdf In PDF document text
    • http://phutungotodungha.com/img/files/zibavesefewugag.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/56bfa089250d990fca705fad3b94706c/98830009406.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/31481592308.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/duduroroduv.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/56994992326.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/56394074819.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109071420038911.pdfIn PDF document text
    • http://emeat.ru/var/files/75773295174.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/19734664573.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/bowun.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb470220cc---dupikaku.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/249ef2859e8c4e87913ee79df607299b/fewusafekam.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/wulerutavujelixugum.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/lomazamaladapozisidax.pdfIn PDF document text
    • http://hidropro.hu/upload/gudikabolixuvo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/8819158009.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zadazinudofazuwu.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/dijokofididakelo.pdfIn PDF document text
    • http://fourfoods.com/images/files/96269668093.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gowusagerujepidorur.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/livodogugorowixib.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/rovevugif.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/37861715863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lcd+resolution+apkPDF 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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 18080 bytes
SHA-256: 3eb9c84cd0a07fd81a4627c23449e251c0fba753678bd0058692c8a3d972e90e
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 10656 bytes
SHA-256: e130799e86cdf09edd41f2c6252f9db83692d064c870a5e16236a8588e40ae35
font_02_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1