Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d77ad75c8ce1ef…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 02:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3155754aa3ba1c49b5a5047950cd6d3 SHA-1: 39bbccb131bb73431cb515c7630a44c4b21c75b8 SHA-256: 02d77ad75c8ce1ef23f17b83f47c1fac0fb273bdc475d26a53c0df192d3c99ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a fake browser extension or update, a common social engineering tactic for malware delivery. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=jabref+for+android PDF link annotation
    • http://transportdiverse.com/uploads/files/zalibinutejuwaloxesuxem.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/47454756994.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/4810872120.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9c43363ed861c30d37ff1ab9174b02ba/lugopefipuno.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/49122359845.pdfIn PDF document text
    • https://premiersuli.hu/files/files/xutoxo.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/ruvumozusuwag.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/sikamusazufesibu.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/fepanutevuvasejedapa.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/88752761952.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/94450547209.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1b189d76abc3cb7115a4e5ef959cf03b/zozevepuvanilozuposejabej.pdfIn PDF document text
    • http://www.bash.cl/media/file/bileralaketi.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/65969787428.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d130617770150e1290a5d119a1905f6d/16151117120.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/40653110103.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/71340542726.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210911_175736.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/12139260938.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd76d773eb57b3c684999e3e2cacb4fd/pezivofafowaforedisi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/86f0a269a103a12aafa7be3db956143a/76670546904.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/553f286887cf21aa02585e6845674eb3/teliwinuvoluragibibumit.pdfIn PDF document text
    • http://hzqzg.com/d/files/98778329924.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/52729395328.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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 10168 bytes
SHA-256: 2b647cd5b4e4ffeef25052bd34a391ded75f532d7870e536652fa2c741f90ade
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 18376 bytes
SHA-256: 0069aa38dcd78bde56e2e79ead977ea5b50e7b710a5ed9b58173cfb65ca2a3d1
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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