Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba0e5c15e50464…

MALICIOUS

PDF

81.5 KB Created: 2021-10-05 06:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 530e96380c36f7ef99db62679c96e774 SHA-1: f56943b9cffad45518b9fe1c483cb25f48498fdd SHA-256: 21ba0e5c15e50464fb88db0381ceba41a6698b5b0a61580a3a413c866f0e0cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The presence of a 'link farm' pattern suggests the document's primary purpose is to redirect users to external, potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=angry+birds+go+old+version PDF link annotation
    • http://nanoservice.cz/upload/file/61002181472.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/27/feputozipabukasepupir.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/puvilafawo.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/jilidoduv.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/rudibemaxigevebuva.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6504dacdbdccb27c6cbe166ab4a4c8f2/kemirejojanox.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/labud.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e8603c1a994ffbbed2f2ccfbb3becca4/falugojekulekuxokavexu.pdfIn PDF document text
    • http://didopack.com/files/retelul.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/vijaraguvibirigavubeb.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8f167358942b0f4d6e0ed54102e374ea/lenudegudugiwikuvofexe.pdfIn PDF document text
    • https://go2germany.ru/files/file/72653161410.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/54262799398.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/33573498030.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/nidasulemariwivuragusunud.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/91342620805.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/fipoxanivaridirubarutit.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/20036286684.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/panovupi.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/97408350077.pdfIn PDF document text
    • http://webbuilders.com/files/file/malob.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/forikotumilaraxuxavakow.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cc02a1ac100de00cecee050a0419d527/45053807813.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/2713613938.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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 10464 bytes
SHA-256: b6b9748446f60fdeed2bda31eb544648b60044eb35e28c319cd1a7891eecd4c9
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 17544 bytes
SHA-256: 8ee562f70d805a801a966313fa777b18736fe074c0db1576fc18574083d3e74a
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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