Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a270583972d777f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 20:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 851925b3a364852b5a62d7a877a2f0c2 SHA-1: 5c67fa936f9ec9d1bec8cf93d9fd8995ba6572bc SHA-256: 8a270583972d777f588ae1927e6c0a8c052b47d9ab5215e2b071e1f17447aca5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mvmdigital.gr/files/files/50684939050.pdf In PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/jogotirujavoka.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/25584910410.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/17736699548.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/17388302387.pdfIn PDF document text
    • http://nomortiga.com/contents/files/japowep.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/85553911288.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/8112374065.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ed19e4657201f00fc54f679c668c19d4/taxamuzevifazaribase.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/30281895600.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/20509153744.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e97421b---60383344384.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dq3c1bnm035nl37mklv2tfimvm/45657330462.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/83buevfrj97ska10u4s6la4le5/1325760158.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/94893621868.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/88837227508.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/81602077260.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/22565371601.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/70713514976.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/fewoziguzavezudevidare.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/74456733414.pdfIn PDF document text
    • http://gaudi.tw/upload/file/56467105432.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16132baec577e8---78511848052.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff082190---28007663168.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nasazefifekaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=avengers+endgame+123moviePDF 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_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 10836 bytes
SHA-256: 8b976b237124017c6f4131a38d105daf8f2bddedb12e7ca7d8a122117d8380a2
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16548 bytes
SHA-256: e928db7ba0b42fa560fd3c1472723870e6bc4e2e62336774589d241404ed2163
font_02_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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