Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cb55df9353a39a…

MALICIOUS

PDF

73.3 KB Created: 2021-08-05 20:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a58b5381af36cfa94b297faa60a8c88 SHA-1: 5881fdd1cfff004c72c7a82fad6ab0feb3e7dd8c SHA-256: 70cb55df9353a39adfc1642b9b039e2844bfecc834f3e7bcb1e6643f5ae672c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to distribute further malicious content or engage in SEO poisoning tactics. No scripts were extracted, but the nature of the embedded links indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5471

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/85hshsl3ktqhit2i3mjuh3eeoq/29184576860.pdf In PDF document text
    • http://remobudostol.pl/pliki/vamusumiwimodeludi.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/23900663274.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/m55keiufuil4k1enj0td5cq9ka/muruke.pdfIn PDF document text
    • http://dentali.cz/files/files/73052777090.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f230e152137---84641420801.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/90628348211.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/rurbffc79u2hpk2ibmi7iqhsa7/81750425837.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/50cfc1e6bd4e4062724a777e417866e7/79180318359.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a927bc8ed8c---sanesebapuwe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd9035693---24760565930.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bki9cpb0sc6oog4bqccq48gfq4/purum.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/3502219135.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/617c51f2e21a8c4fe7eb899208892efa/dagefagorabizabibe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6n1uqk5crf9f9m7b4gm4vaodp3/pudojamezidapef.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/71686582746.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/kijajadebelotaju.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/jaserefuduxewaf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jubovarowupenobok.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/83221949140.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/755b0c22af995c469e9cf6c8d9b16546/tosuko.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37534a7706---sosofixupowudizuvi.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/82725604446.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7509a2d1b0---23624164068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fort+mcdowell+bingo+calendar+october+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10988 bytes
SHA-256: 5a1f1341db4ad291a815a535260d8aadd62a70f7e489db34c3be2e7588bebd49
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17364 bytes
SHA-256: 5b5e5651f084fce698d77b400d1f3743cc543218eb9bdba1e830ad76c30f13f9