Malicious PDF — malware analysis report

Static analysis result for SHA-256 a037c013f8f7cf9e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 20:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 58de12f053c2c077fa0ea021e06acbba SHA-1: d6bff07d7c36a41487738da1963d9e4568a062ec SHA-256: a037c013f8f7cf9eb9e9a2d9fdda85b9d0b7b1c4a86d2078a80d1c6c2c3387fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of numerous URLs and the ML classifier's output strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

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://cructi.ru/uplcv?utm_term=cost+of+cortisone+injection+for+back+pain PDF link annotation
    • http://iltorg.ru/upload/file/polutemizalokaduxegaw.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/93037741427.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4cd5770c431b4a15ebc14102b5a9ddf7/25667888016.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612561200ecac---sumirojagiditipin.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161282d6d1031a---fawelipivuzonopajiwedanud.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/majubexilevajokukun.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/90670766557.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/56453832373.pdfIn PDF document text
    • https://hse.tw/upload/file/zavolu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/nuzujatidame.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/mefonujipezazuletoz.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/91147239118.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tovudixo.pdfIn PDF document text
    • http://muszempilla.com/files/file/16078638289.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/42182213070.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/54976187105.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd78d4bfc6---pokakuzedukavul.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/33928111959.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/92928808712.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/kepiser.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/42294517476.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3b7076c0---gebejomugasojesoranuporo.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d34475e6---xukekabeliloretiv.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_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10820 bytes
SHA-256: b1700065c347832cca9240ce965509b40879b3488091ba7dec2fe949aef13862

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