Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a076cd62a785760…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3755f2a5046e77638f76eac837bf8b1b SHA-1: 18fb7b5f7a4fced252cb447bd1c398515342106c SHA-256: 4a076cd62a785760bf1e365cd6433c614cd00be3887a8a151614e6fd9a8eb853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=control+your+laptop+using+android+phone PDF link annotation
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/kiluvere.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/98913731681.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3e60a7a6---lulububesomomizalodik.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/refovosu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc59c393c---98195927341.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/13041484234.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/67602640875.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hiruad2qm9k79arufhl3mhfij1/zazewabegofakobur.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/28519726767.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090508150680554.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/52556413148.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/wowikukufu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/35009242218.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/70239171770.pdfIn PDF document text
    • http://maidichike.com/upload/files/43219770899.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/57909712251.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/verotapokidogiwurevomiloj.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b2d1556f4d934cfca19b3d0e8cf3955a/58114328356.pdfIn PDF document text
    • https://aedwea.com/upload/foto/25867398500.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/35826075338.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/96505157253.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/77754028303.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jezipoduzogapukubigo.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/24505417811.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/tuwumavot.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d934ad588---donavojigox.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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 10916 bytes
SHA-256: 08451027cf3addc0bf22c06a9afc09c8b3d76e7eee2642f3782e300984ba93d3
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 17620 bytes
SHA-256: fc0012315258c6d59d473d55612deaa7811239109f5601f482d3302117161fe4

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