Malicious PDF — malware analysis report

Static analysis result for SHA-256 40277b4b7c78e3d0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 02:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c917b78fc7d8f76aa745a5bada1efc4f SHA-1: ef7e4677b12037a0f378d80cef0ad9db9d213452 SHA-256: 40277b4b7c78e3d0f50e16a20288aa64248359220e3711a7f27591ca59058632
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://signauction.net/userfiles/file/22277625854.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6e45793e---vupozivabevufojivunez.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/43004381063.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/73522470178.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/13318481641.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210909104518.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/24634983751.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/demutapomikomejuredefeno.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/2927146800.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140710ee9b54---68120966482.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/nikotekiselasenerojoro.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/nupebigasurefexi.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60028915417.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vinuwe.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/fapuwibadozodevisobevepa.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/80254737641.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/22192281767.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/bazab.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/25bb29fb21efa0620ec9f492a474c86a/86142330652.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/gokif.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3aadc8dee---42983764672.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/boxizuwadolilidudaxibep.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/lofota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=types+of+psalmsPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vizebepipeduv.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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 10204 bytes
SHA-256: ceb12ee3cb057972765c16a34d4759a72930a83a0a0ab3f7e908686b5ac8bd0b
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 18484 bytes
SHA-256: f1460f974fab80aad9a96719c6a3f590371732d1395181d7162494aa1be1eb85

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