Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecaf3f83af0e79f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 13:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0313baec88542aafc991092bb91ba417 SHA-1: 7734e1fb32769cc2dbe30fdc96dba62e57827af7 SHA-256: 7ecaf3f83af0e79f477574b66e4e284ad2248c71192baa4c340ca0e9111665fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for hosting malicious files or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and heuristics suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a6667ea7e---digirubimawuzobevugodojaj.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a46611e4826---sopixudiwogi.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/25567856891.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/30873067713.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/mojoluwobazifo.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jazazenosefanox.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/15274762525.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/fagewazow.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/monufakif.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51ed8a9a7---63670016187.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/mumexatozulofesafubu.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/12770440036.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a38c3d8a---wuxedidepagajufinabusiw.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/ziburegivasatug.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/95346509857.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/96c6aa386c728538db7cd1070673a602/momuzuwenud.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/juzinuwiwojarumawuwopote.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/28442384265.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r6he3h6g96s3spug0qod8ppvc8/880409235.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/bupexafilifamikag.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/63846590761.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/5713447853.pdfIn PDF document text
    • http://cosyromania.com/media/file/19238675708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=15+centimeters+to+millimetersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cb2a12cb36f71d227900469a62a0072f/47346728511.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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 10320 bytes
SHA-256: 44c1a6fa93a5be4d3eb6da7fbcf2272d3904899d8dc39059ed3fbc97db971bd1
font_01_sfnt_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 18108 bytes
SHA-256: 9c5efe26c28c1233046e610fb3f3baed9b3e35840b671c056ca564f35090cbda
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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