Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e3f22721e4a0e…

MALICIOUS

PDF

146.8 KB Created: 2021-08-24 17:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15375330a575847e74885559d3e861c6 SHA-1: 10cd1ed1139da75585cd00d43383074be5a585a7 SHA-256: 169e3f22721e4a0ed6f472f68ec8ffe3a384954e2630e88244300176ebd20a0f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm or phishing lure. The file's structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

Heuristics 6

  • 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
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d8f451a48---57719553006.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/muxuwidebewuraj.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b320d388f0992361f8b48d5d07a9c618/lefovixonedepem.pdfIn PDF document text
    • https://bloomeng.com/uploads/94611842985.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/851963e92901f2f6ca892ee7588f2522/xazufugobemuvuxivofan.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e866c882---vutitiwulopa.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/32447417015.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/fugenijepemabisa.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/28950467932.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5j2ei1ejmu9khjfkblkob9nr8l/ruvuvuvunasariwa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f2502245---ledizadevezaw.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-14/20210814073514486731.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/jejupagugoritowuvoxow.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fc553cc12871739a0908ee5558cf59fa/27257884758.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/32770950376.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/51468229131.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/38763461125.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732e5a65822---tofiloj.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/eb032b888dc79562472a6755108bb6b3/1929882661.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e3e7ec1625526fe2cfe0da412ef78df5/nofovoxajiguzejotode.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8082620065.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/831d91f161215ee716ca26309ca13484/11450786536.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/28716760716.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jumodip.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/belav.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/rodonapimaxewexezofanawaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wolframite+is+an+ore+ofPDF 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_off0001d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D634 21804 bytes
SHA-256: 87b5cefeb288bdcb243071d8111f9d2013e880e5701d97d6cc25698496b50a15
font_01_sfnt_off00020c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C68 10368 bytes
SHA-256: 1cbfb2d2c4d06c1a10b460222a85b87ba4eb09825aaf7faf2fc7740b856b2f7f
font_02_sfnt_off000223d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1