Malicious PDF — malware analysis report

Static analysis result for SHA-256 1160a09a60a4ddc4…

MALICIOUS

PDF

84.7 KB Created: 2021-07-26 05:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f567fc46df4ca8f0388a95e3f25160f SHA-1: 2952c240a51b1e46da15a5b95a547f208e049a2f SHA-256: 1160a09a60a4ddc4d86df61d076b600226e65d53db8cefe3deb2f3453fc29377
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hagabb.ro/ckfinder/userfiles/files/lujozafewugutuj.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/dunut.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ijh53l30gt0n7jv8fbaq6d2k6u/sanawamilanufikide.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/86199830751.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/98653511732.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/3347678365.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/20115612857.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ebf080ab---98089733182.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vogovabonexosadifaxuvupib.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ca27946d---kozipekuretumamixogiwatax.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/seper.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/83432354203.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63cf1f65adda854301e832a4904a8beb/xemutisogimaboxukex.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/surirufexosuvonufoxefe.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ab89c7bd3b9a4c4352bcd09b3d5f05f0/mokirukenozekaxidibaku.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/62786476400.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/jukuzab.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a82251c71ff---50186635905.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/43383132068.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/792454175eca168e4e099458b9712a39/64346352850.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/vodivebemisozi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/77809133110.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/wagatavutuva.pdfIn PDF document text
    • http://nensi.si/upload/file/mapumodaniludugefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+bathroom+warmerPDF 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 10272 bytes
SHA-256: 9519dd61fec63162e56e7d49eea8f0eaffb87e08421a4fdd3c9b7a75e1bf328a
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16428 bytes
SHA-256: 0b52edbdfc77886b91fe9307f5c3906cb505a8e5887a2a52eaeec7548070b5d3
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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