Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23a8fac2d878680…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 01:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ce11ba11fc5a96d08424965600862f13 SHA-1: f9cc2ab47e67a0833351198c0b4062a2c6c236df SHA-256: f23a8fac2d87868006e67d6758569aaeed86783e6202a694d174985ddd4ebfde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=noble+gas+core+notation PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc94e8e7e---85692521883.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/gosaxedulomuwumaboruxe.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/sunerixux.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/folisiwijopok.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084783128faf---94611170111.pdfIn PDF document text
    • http://jkohut.pl/file/45207200146.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210815175400.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/pitorixavejexixapaw.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/tunodamodo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161051ba058919---masagajudez.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/bagepepawolefexi.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/15625442187.pdfIn PDF document text
    • http://warehousetraining.ie/images/dizadivuvazegoze.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e86dc2e8---68740403793.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/2680577892.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/76263553640.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/8936846709.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/85052821169.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/libiwuwum.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/tezudenumubakabugasixin.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7afc156f8---fegapamasapezuverijudo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a789df6f0---47064285310.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ml05biam003miaa78kr9ld2v67/donixoku.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_off0000bc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 15476 bytes
SHA-256: 0cb628e49e7b21157727f18ea6aae9db1f19a94a8977ae8ff9372f92ebbe129d
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 10520 bytes
SHA-256: f0ce2866f45b8bde778cf3baf1af69fced75ce6fe7ac402223ae59fe93ba4b92
font_02_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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