Malicious PDF — malware analysis report

Static analysis result for SHA-256 90afd53755c8b489…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 07:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24c8f2d516388dbe1f5ec2f5193c5039 SHA-1: 6d386482a1c751c645ddb543d6b8394c450e84a3 SHA-256: 90afd53755c8b489b09e74d4704490ba4f9377fbbd5595cc68c57c8e2aab7bbe
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting domains, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://angelcabrera.com/FCKfiles/file/13210113214.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c40f189de6660b47ce83bc53f0f906a9/fefusuwadavuposideguraxow.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/birufilapese.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/mufasivubuvin.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0ac0f78c5a9696d2cae9d78207affca/wajobovub.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/239a7390aa41452f54365364c142b476/woserubuvaxegifab.pdfIn PDF document text
    • http://www.jnvhardoi.org/ckfinder/userfiles/files/xuvilara.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210909091039.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/fawajugiwetubonigamo.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/buzorejavezexoke.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137d859c0c64---36576941901.pdfIn PDF document text
    • https://attack.lt/images/files/78984792628.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jufubobupinepu.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/72426131447.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/zubos.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kebaduxadapagowisatiluseg.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/jemidemanuvus.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/66572878541.pdfIn PDF document text
    • http://ccsl.asia/files/rujuzarofofenadazaj.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a6ad1fe7---91405873310.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1b6abf52---degisepibi.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210910091943.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/85030421904.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/25401839153.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/83430573434.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/46549953433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=arrow+os+redmi+note+7+proPDF 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_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 10460 bytes
SHA-256: 453818e172c5fff082cea833d1909665f2a8fcba69980d5dc3fe205acaab1233
font_01_sfnt_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 16984 bytes
SHA-256: ce398ce15c3d98bea017dbde6f8bfcf72f2feb2bec7b9e8d25500cafee39fee2
font_02_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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