Malicious PDF — malware analysis report

Static analysis result for SHA-256 764fb4190d31449c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 09:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f576802d37a1e1225c7976f4fa48fcf7 SHA-1: 0b4afbfaea2d1a05bdd89e8657aa32fcc7e784e6 SHA-256: 764fb4190d31449c78f977c50a69be9e141c7499c48bbfb3dad1870512782441
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lkquekpdtalplbq20oo1qrj141/tedew.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ca785784a78eb2105258c92e20711e42/52989954674.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/33875538378.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/vovokewagisimopugabomavot.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/18371088650.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/027dde4b7ce31ee819b5db4009b811bc/pugewoxebovix.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/zikululilonamebe.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdcfdd5c5---93676851634.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/vokasalugan.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eb119981c038b2bd72bf2e464eb397fc/zilizurokoni.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotafibobomuton.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/44671606367.pdfIn PDF document text
    • https://securitydm.net/slicice/file/rimini.pdfIn PDF document text
    • http://mcutech.net/files/76839437030.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/sesotasosujiva.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/perow.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43368279823.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///40364962077.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba37f72e9e---nituxaw.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084da7738f30---sulorenu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/nafijukesi.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/1977865202.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/5239300361.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/94735200849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cell+structure+and+function+worksheet+answer+keyPDF 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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 16084 bytes
SHA-256: 83492afa0733b2c7dc8bd0d52e07f24973e5e2993a13b38bc653326ccea7f0c6
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10996 bytes
SHA-256: 2ff8528167fd3d4e257928aa5d805bf848658f18f145cbbdaa4b46bac849b70a

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