Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca013027567e5f4b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 23:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b7774889551a143bb54fac9e5975639 SHA-1: 2c1bc0017c402ff6549dd8b2ec38de83054401c5 SHA-256: ca013027567e5f4b7ca59b13d8cbb8ae8508b10c505cbb4da0c4570a215eddee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially harmful content or facilitating further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mu-rrrc.com/userfiles/file/jinusezakefenum.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea3515759---33404628264.pdfIn PDF document text
    • http://immopolignano.lu/images/42319203732.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9759glgvtq14g4m1gp47jnlgnp/31395946788.pdfIn PDF document text
    • http://kaies.cn/upfiles/2108050931557986212oe7sv.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e3954bcaf3d3a5741e361d5949463e0e/76215286094.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/16398724096.pdfIn PDF document text
    • http://abnicum.ru/files/file/vuzuzexinuxabuvoxozeful.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/lipadogonusewop.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/l3657fdct1c64vc8da0ce1p3k3/77766244554.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160856d0c1d7d4---gizuludopabuwojuxipe.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/wivomakatuxodobuguvi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1e48d490---75227145603.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/rebetukopozalepawadijeku.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/rakugelabiwujavapesuvovol.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/folememu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0d4d5a689---nibitodatobeki.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c4afed19d8d95a0d568e30f13e68482e/zexukagap.pdfIn PDF document text
    • https://ms01bet.net/contents//files/gozepib.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/goxuxusagixiz.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/somodukoxulefatovobabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ocr+software+to+convert+pdf+to+excelPDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 10800 bytes
SHA-256: d020aec0595cb823b28a45e64106340a3ade6f48c5f1840bef80f4b854d6b8a1
font_02_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 17484 bytes
SHA-256: f69133e39b47790776bd5fadb8af24586fc13cc4b302c305cc919aa2ef92250d

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