Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4b47e136444d7d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 00:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82ed94151089b9fbcb709fe5d9c4347e SHA-1: 37562508ac3314c86d1eaa17d97df8614561a521 SHA-256: ea4b47e136444d7dc4bce9fa4a7f3b30e7da560f1b140697c7d8dce92261f5f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the heuristic findings suggest the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=i+hate+love+shayari PDF link annotation
    • http://omatsuri.kr/data/userfiles/files/tusagos.pdfIn PDF document text
    • http://cwesp.biz/upload/file/75454807021.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dakagasibufatixefajakom.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wimalaki.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/57451379786.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/2395502156.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kubujuxaxo.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/togijosijikisitoxepu.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210911_005739.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c808724eb---78623690860.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/zebovi.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/duvunokegedapasuv.pdfIn PDF document text
    • https://kaparatt.com/images/File/20109683692.pdfIn PDF document text
    • http://ubest.ru/images/file/70305170456.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ab2e1a47---lipigijovixin.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf0835f18---gegizugiwotowitota.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/89868057752.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109150855106347.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jezeva.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/siletunutowosuribeno.pdfIn PDF document text
    • http://eva.am/files/a489deba9f9d9e54.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161308f0398cc5---85029388542.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_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 21320 bytes
SHA-256: 431b133869794d55bea566d6c96cd1e313319f6d807cccc8123184d433cfcef2
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10232 bytes
SHA-256: 802e06292b08c96d5f0ed1f9711f156a75a9b7c0b67b5c8140ba217f7219e225
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1