Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f066ca1ec1990d…

MALICIOUS

PDF

103.6 KB Created: 2021-07-26 03:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 033c9a244a559ae1ff786f5451991e3a SHA-1: a7cbab16652c60260826f5aa6faad1d962c32635 SHA-256: c4f066ca1ec1990d804922f27e27e80e5947472b5ef87d3d7e14c3f4c8fb0846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://3dtechgroup.com/uploads/image/files/gogorogivepe.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/68909527383.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tifivenanokapujosalekikoz.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pusifowodavejipizelamuro.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/56877368769.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/bemagegalik.pdfIn PDF document text
    • https://emmaushuis.org/pages/63299821312.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///vadafisesofajaporonetokaz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8hmqqi6b564l866avldnj6kd03/fegalolamewejorowapu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc60532a56e---forijilubekogaje.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3239e0160---tibejijulowimuvisisa.pdfIn PDF document text
    • https://actor-conseil.com/files/file/7268008130.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/35237907669.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/14095347872.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mezokopinanesud.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d10f1e66---valoten.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac4883ab4---nobasivubebofunem.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/97083528112.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/til848hne3per7glimmr8ga2ja/66666448483.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/zonebesivutimezazariwanam.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/witepijigusum.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/492488056945daeb4161c7b17c49af44/pavifunaminodugaditosomot.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/7570955260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ragnarok+m+eternal+love+job+build+guide+magePDF 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_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 10996 bytes
SHA-256: 6b0b33c80fe19f1e33edb852a192efd537124a64cd1aca580f176a545f6b0a6b
font_02_sfnt_off00015ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBF 18828 bytes
SHA-256: 2191dc11da7b6777183103c72a50aa0ba607ac3efe495d421532ae8a5788ad16

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