Malicious PDF — malware analysis report

Static analysis result for SHA-256 331352aa90c6c76a…

MALICIOUS

PDF

69.3 KB Created: 2021-07-01 14:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a4df651510f1302195d197c1b55403f9 SHA-1: fd276e02f3ea5b80d5dacc676eff83e8373d07ae SHA-256: 331352aa90c6c76ac574739dd331ce1208642348af1bf10f044a305398586079
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading further payloads, likely disguised as software or game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6569

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 https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/40997f6230cce129f3148bc3071e260b/watotewopomarorewudofedu.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f347rsm2igjc08df9dfpui7599/79990448992.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/lupukotezetananunas.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/51bbc6da5e47fb3becde9296f84c9c33/rokoxakoninuba.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68d72d6dc---xejilufi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1af0078e2b---51573974063.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839d41944e---32939386437.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/32b1dac8145a4b640f17916f97390d03/34458561173.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d99274da75---69997678650.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6bd676dd06fed5a5d5177cc97de03d0a/39980984541.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/61788883988.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/56220974025.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/43623938735.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b8e6f835---53055337212.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/52044322220.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982ff48e939---purukivogijawe.pdfIn PDF document text
    • https://magatek.com/documents/file/fazamikijarekilap.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55e567a9d---ronabot.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6l1184qkfhubi9l9fvm0vc30i7/27576678373.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/vq38dhbtspnpa0vk9tju6m50ld/44449637513.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/newavekewodikezeli.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/99090012247.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5be00bafc---pumixegiwukagawataraneg.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/62676777848.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/meveligafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+hill+climb+racing+2+hack+for+pcPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16888 bytes
SHA-256: b0519b276af95a40d4866c38282876b144bba9e660de12b8ee5d9c525bcc5e6c