Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9ef656997afee0…

MALICIOUS

PDF

60.1 KB Created: 2021-09-04 16:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd13c4004f4f4a4e6f3c2a89ea3e5a15 SHA-1: 98a78bbc789d0a255e89d7d8065423eeed6e435b SHA-256: 8b9ef656997afee0203c654b9196155fdb97f506f0422cfec5e848b3bfb09dac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=yoga+sutra+pdf PDF link annotation
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/daxovavatamonedigoz.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/68629573502.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/58540442170.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/jinag.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489ae64581---voguxodenosiwaxobar.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73721b8a98---74830795587.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075942907fef---sexevefagivivovus.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/61535665652.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/55809072098.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/315e529044044dd18ef193a5f11946e0/14994086882.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/90959136990.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aeed4666b---wugenerabowipijoxiw.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/80266982719.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/75088102711.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wuzinagewodufi.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/lisosegowaj.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/65484478474.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3f0f8593378440d95fbeadaa635b4f6e/83245841002.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t597vq6is4hv7ptl1dbcom92pt/zubovevetajumanuses.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pilotawexakaputexid.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9b9111c0c66854f18e2b7c1da4fa244c/26669996664.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/31872500671.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/780770110c2f5b1a90f44bb080eb10ed/2947042683.pdfIn PDF document text
    • 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_off0000b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB854 18412 bytes
SHA-256: 56b46397161f9e5171d3816859692ba810291eb269207a954bc5f2982bd6d697

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