Malicious PDF — malware analysis report

Static analysis result for SHA-256 549cfc26f056bf0b…

MALICIOUS

PDF

104.9 KB Created: 2021-09-15 07:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b20c31970c07ab913c9ae6f0345a6d78 SHA-1: 0219e5dfe2f62e680d3a96ef2dfefe115c9140cd SHA-256: 549cfc26f056bf0b7e513a28938d62ac9d3b19b30951bbdc4c718289c901ad4e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://highlander-inn.com/assets/userfiles/files/19085516154.pdf In PDF document text
    • http://ha-sine.com/d/files/46648853321.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/92409693297.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f02dedfa---77588655900.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/musapaxubepazivujutujije.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/4764631945.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/22788225590.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q3l3drugej3fmfgktj1acj7tv7/88180379033.pdfIn PDF document text
    • http://goref.ru/files/file/wibuxibifeji.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/411a30b87e6ade759eae15700c5d434c/5689519819.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/virebisujuzomegizuzagexe.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v8ot5j56s64e6lveua0c0otoeu/96598862330.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/75063649462.pdfIn PDF document text
    • http://gro-felix.si/uploads/55030555677.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/fodoxekiv.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5d62ac3e---723023148.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903033055.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/kinanataxuvekumo.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/vifewolufa.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/62054618382.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/fefakewu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jabufixinikizedo.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kumitosirexuxetebanisez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=steven+universe+future+episode+9PDF 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_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 19756 bytes
SHA-256: 5511955ac905b728563e760045fa054d859d0389145f02357f6d90dc5308ca0f
font_01_sfnt_off00016517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16517 10692 bytes
SHA-256: 8345da04a8314fd9233280d89e42a036714ec71a247cbc644e466bdc33064b78
font_02_sfnt_off00017dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1