Malicious PDF — malware analysis report

Static analysis result for SHA-256 4403c0e5e6178bb3…

MALICIOUS

PDF

82.5 KB Created: 2021-08-04 18:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e3be1506403f12cf83595eb054961760 SHA-1: 0683e5a62c0467229eab6eafd9bef1ae74908877 SHA-256: 4403c0e5e6178bb323f687e7ca3e5b7a654e859f4a1759c3193f39fc9d28b038
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85ddce580---34368820140.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nrnj1ir7mh66gch3n5fvvqm6vp/gisifilopibuvusuzakafe.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/53074559584.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cca28b0b---dimeduzelifowikefunel.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f8646540595910b31c87cad884bdaede/60269326273.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1226647244.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/14178968921.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca95034d67---sesasepatabinakifigig.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a83eba61632805111476a3c3ca51fa3e/83431986389.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/xomupi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nodunowimiduxe.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/65912138949.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/34029309820.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2802c59b05c285c8297ed2c4b7eed670/liladubowivevopa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i6skbeh9pe28mvujne34ti99g2/lezijakafetib.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/zuzusufanuwo.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/56098597435.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/76440984088.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa358ed26---92619183199.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/sizanunijexifomawa.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/bedadani.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/zufitomalawasunopiwug.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084a769c6d77---47407663315.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/kejemif.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/digapakoketa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jejabevan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=t%C3%BCrk%C3%A7e+mp3+indirme+siteleriPDF 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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 18560 bytes
SHA-256: 8f8ee6931f89a9e8c61669faa4af07f7817d620f1563e7bbb0d6e777990e6635
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 10888 bytes
SHA-256: 757adbb52e60a7068ecad1a0b3781b101d5521a97528310bedaca4ecf9ce971e
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1