Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51249d8ef764bc6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 03:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6386961df344ea6355790ecfeb4e65b SHA-1: f33ef5ca418452690a5f0245bce9f23bcbc6b38e SHA-256: d51249d8ef764bc63e79d38abf415d7e442205531e5f38fdec1158abbf23577c
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 WordPress sites or other potentially untrustworthy domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dodomacnosti.net/data/file/18762348790.pdf In PDF document text
    • http://orem.mn/uploads/files/jawaziburewofu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cecd78f0e5c---xagexusizeveripuxisumusu.pdfIn PDF document text
    • http://expresskaliski.info/file/38930723905.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df28e1df7e---vopifer.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/48498436862.pdfIn PDF document text
    • http://skupka23.ru/upload/m/lopusaratokugaxon.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160855e8e378e3---47974395451.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1000b1049---67640417835.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/kegixiduvugakusigorog.pdfIn PDF document text
    • https://icbacademy.com/upload/files/92385508953.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c74090e1bb6053477c80a110f0bbdc51/mevurenivomemaveribex.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/milerenobebukimi.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/konomofulis.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gopevomofixeja.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bc7b758e1---wamukewuzufujo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/37c5b1062fa6097976d7234756a9d722/tutomazubijutofapevanu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e1d5e80275e0ef133ade423819b57e3c/77007747770.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/60985135419.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nekogugu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/xagabexutumozesesivided.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/misitanuzarizaruwitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ospf+protocol+pdf+ciscoPDF 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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 17616 bytes
SHA-256: 254ca4bb8dc6eec7f44d38ce09fe095073543941105b95e1f03d573a384d27c6
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10240 bytes
SHA-256: f19cf420da3a68901fc825b5dfd6c0cfc8ad29c1822786ba8d2f0916d682dde2
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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