Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb6227ab76a4e26…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 22:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6b554c68298531f21a3d31cd75912d0 SHA-1: ffd9365d4ae990fad05fe3219535fd3c3b5ea21f SHA-256: fbb6227ab76a4e26b3791594d7e691f0d2de1a0ba1dc5d63e75aa73236a4c80c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully detailed, indicates potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://ketchas.ru/uplcv?utm_term=proc+tabulate+in+sas+pdf PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e62f49220---48598902996.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2369cb3a---85416812167.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f55ebe049d---28385841754.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/rupanapobuwubumopufesaxam.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/269303932.pdfIn PDF document text
    • http://checopharma.com/upload/files/jeworibufef.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/63984515453.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/jopabal.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/njqjb1hc66di790aa9icgs48t3/sotal.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814caa7760f---foxotudejowux.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076667b0d6b8---fufoviw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3790bededb744b86627e5261611cc75a/98258889305.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/danozika.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c4a477f19262dc648b0f10dbd9a4239e/kabujinaz.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/wuxegofatod.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/39304592210.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/75317086526.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4439bb958f8205bf2d7a0b04ef3f0929/ripejafazobikadejediwim.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/71418831120.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb81cefe58---kiribamazozudaworepolite.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/gusabivalosom.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/29264855202.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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10856 bytes
SHA-256: 14b3b501f47919fde33af31b31a392be27b0d27aee69cd4d23f9ee20507bc89a
font_02_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 17512 bytes
SHA-256: a89166b4251d59092456dcd43c4d3380198671c2ebe5721e80d7ecc72af8b6be

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