Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c518bf2ed3ee2a…

MALICIOUS

PDF

166.6 KB Created: 2021-06-28 07:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 647a434c09c92a144e64ea3fe3f41a0a SHA-1: add6d3c6d1a29ce3f797a5a8eba1f516adc3c7d5 SHA-256: 14c518bf2ed3ee2a9f9b807de954cf9b1570090255b19d9ea6af18fc112fa84c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9243

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://sieuthivatlieuhoanthien.com/upload/files/86979441058.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0cc1833fd07166147680ebce6959c27/1655706157.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/puxubimowizo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c70e64d49---70921832014.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/ruwozozibizuxumudovuxax.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/posepizenemakogagef.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/65229810244.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c14db59e02b---93418567071.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f369e6d6---terun.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abafa613f16---22001191118.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/40d42d672b0afcc446930c31c00b8fe5/9475873627.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/062526ad78c8df33328a9b76a471f7de/25472001260.pdfIn PDF document text
    • http://indecomavo.pl/inc/82033956827.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/85582020303.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0ldj2erfukoaftv8rqqba46l41/juxakobasufofaxupalavolu.pdfIn PDF document text
    • http://erex.hu/upload/file/vularizipefobikenire.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/17052694180.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/kowirob.pdfIn PDF document text
    • https://digicpictures.com/downloads/zofulijutopubopoladajuk.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69e1ed538---tajewemive.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1948460956.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/29047392922.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/9a35ad6d88e3daa55bbe2df85654f826/fevef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ease+the+processPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00023410.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23410 33892 bytes
SHA-256: 954551820b47e6d7ffef4a37e6c9f48d82c0cef603f66db1bbd0300f08a5e228
font_00_sfnt_off00018434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18434 10212 bytes
SHA-256: 539cdd69780cfb9fcd019804940b460a19a3cc1f9e10117d11b040ae82fe02f7
font_01_sfnt_off00019b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B3E 24724 bytes
SHA-256: 0eccd5a0a53e6151063810213b863c559b38e0257edba76f56c52ca7e0b75354
font_02_sfnt_off0001e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2F3 37112 bytes
SHA-256: a9715f1a8515fd9419e18064058ead099955d1c2a3fde7a7adaec8295cbc6b6e
font_04_sfnt_off00027441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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