Malicious PDF — malware analysis report

Static analysis result for SHA-256 908666b0fe3d5123…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 22:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 714dbda6ef7a8ac2abfab8d7f0b4b6ca SHA-1: c98b4d494c811b39b365886011f83e0d90a17ef2 SHA-256: 908666b0fe3d51234783446629a32db3dc1f1c3297f6cc584a9594bd9f674052
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary attack pattern appears to be phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

Heuristics 5

  • 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
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42aef266---zofal.pdf In PDF document text
    • https://incense888.com/uploads/files/202109030512013361.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/xaredo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/99749346921.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/25921609067.pdfIn PDF document text
    • https://ambalatender.com/upload/files/60270400713.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bae8a2c5---xopokokadidumamipuzereve.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/bijozidumujosar.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/pivitorijutak.pdfIn PDF document text
    • http://www.polni.si/Images/files/5062434176.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/88647544689.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109121256317900.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/risutazof.pdfIn PDF document text
    • http://orthopediedelft.eu/files/zagugafezavejere.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kepuv.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d2b7de7---59988159698.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/lavidoladivotovivitewisaj.pdfIn PDF document text
    • https://tl-systems.hu/files/files/78351979047.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/45da9b2bc488c7f464462b9ff1d2bc83/motelebonejekefedopujaxin.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/lebadijuwemeg.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/14564988255.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/9306528889.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/91519337590.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/mezosofowi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/32945743039.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/veritagizaxeveguxikison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=picsart+hacked+version+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10712 bytes
SHA-256: fecc6485a663eadcda27eacb37a7f4973b884eb95acd080dae45d969574bd843

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