Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea50fe15d77863d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 10:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3c0023165caf405b41ef27297a5cba8 SHA-1: ead0b7621d60f6cbf67597be84688c47aea7f648 SHA-256: eea50fe15d77863dfee7cc82c4f9dbe2b341515ae0a1f2d93107310ca216d1a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=superman+earth+one+read+online PDF link annotation
    • http://alexlunacoach.com/img/editor/file/wopivedonaziwipori.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/93791970382.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/142478599961419c1dce95a.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/63645971405.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/kivibili.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/fisesawekadisakoritazapa.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/63706475777.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/37560252776.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/83939589474.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/nunugebinaxazavuza.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc78ac7548---55860696568.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210904155749.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e90474894af5c73a0c4de128e1bdf349/90437664879.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e179qmhn045rps2a1il7p8da20/91828745486.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614194d361e2b---sifosutisikidemuguzupu.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/futejutuk.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zebazoda.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/diwawaporupebuzo.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/73028928553.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109140208562931.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/65143379600.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/zisorejetenus.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/84483602207.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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 17864 bytes
SHA-256: 0626399c6771c634d3a261294883e7d159101000f8d2f1e357c9e96b66947ac6
font_02_sfnt_off00013374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 10664 bytes
SHA-256: ad88eda237d82d7cb3edba7d85615558720fc38bf85c10cbe5ef1ac50d3bddc3