Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e881d3830af2b3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 10:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcb19b647334be1dfa0dfdf4c0ecbab0 SHA-1: 2c9e81f37b87bf5ecfa265145ae66d379f7019ea SHA-256: 30e881d3830af2b3d9927141e82e58c0d7aa746f884ed84cfd09e7a454236cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=iphone+5+bd PDF link annotation
    • https://bostaninsaat.com/image/files/pefaxadi.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/jikojijuzizapagakanalu.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/kuvozaxegafinogum.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/13242710872.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/faxawagegododivag.pdfIn PDF document text
    • https://zzhqhi.com/d/files/85048320823.pdfIn PDF document text
    • http://scro.ru/pic/file/24923119665.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161302e1019b23---zobokijikafebow.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/43358554992.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/14b679b8f12a264824194e4ae87b5886/1291076067.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/69762688209.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/xuvezotuxisa.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/vodofukonenumamalipik.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/78456807226.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/febawemilalarawov.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ae1fpnqk5vq3qjcm575s0ia2t0/69650562412.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/64097871714.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9dfe0878bcb852573a0612f211062a0/sopibovijepini.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/51001069958.pdfIn PDF document text
    • https://kar360.com/resimler/files/tofixijurapasogutazakor.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80955754203.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/39513687916.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/44180066280.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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10048 bytes
SHA-256: b7ea0c5c7b0706cb2022ac0b2e6c32f0e60ea714d8e095657dfce1bf28f93c8f
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 19820 bytes
SHA-256: f64cc671eddedbaf70cebac0a1a903e5bddace8dfb34e5f25800b6d825c6ab89
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1