Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc57b3711538eb4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 22:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4e2423f74652058acb7e3d0de61a9e6 SHA-1: 518aa3000c6db173370ddd34d6abc89ab1a76cea SHA-256: dcc57b3711538eb46e2a0a7c7a0d4efd264b1d62153fb80ad19bde618676eabd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised CMS upload directories. These links are likely designed to redirect users to download further malicious content, potentially exploiting vulnerabilities or delivering additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=words+for+said+pdf PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59c8f1d76---66223778583.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f79a528913f---wabulekigubifosufazamowef.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/rorevefisodavul.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9847c3f06c505068279008e7cb68f6f5/komalaruxurofawomivu.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kibasarulenasutuvebevume.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/68727847062.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97bed2fdb---jenezovabarovegokodevije.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d199f6d5---zufiwiwonidawo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/o009bnbvijk9oq3quf5liqpfl4/33326021039.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/77217517042.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/tupesexokejudo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/1220524197.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/82165857371.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9ae72da1---mexowuwixuvinud.pdfIn PDF document text
    • http://myphamasia.net/upload/files/90000022879.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/22478508306.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/22836218792.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/nekodutetaf.pdfIn PDF document text
    • http://eva.am/files/4c58f00662eb98e9.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/rotipotanute.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/31375620621.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cvu1b4bipghd4lko06jklki3lo/52151602801.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/tisabazepomaza.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356df2220---400241588.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/59967241049.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_off0000badd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADD 16100 bytes
SHA-256: 3600d9e906e5edca414a32726ee82a7490bc59a07a603a6a6b8e712d421fa384
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 10104 bytes
SHA-256: e3d4abadba529c313161769a24cced1f956f61d3d301e38d83bf7f05f7b08235
font_02_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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