Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f411e52088b3466…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 08:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4726b7975cf4a07a80c5ad9e17eba44 SHA-1: 3163123e4a85d5d2c6565f6e45c0d32f2e5d6bdd SHA-256: 7f411e52088b34663ccb45825d86c095a18ec505dd21771756ed0cff744f5256
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://flyingcarpetclementines.com/userfiles/files/12836297322.pdf In PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/pegejaneminukazimikivo.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/letimufagenezixifukup.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0265410066e6c9795129a37b1d22bb13/70185016280.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/16080323702.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f59fe768a---mujoge.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/28164339404.pdfIn PDF document text
    • https://windsbs.biz/files/file/tulunojuxoz.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/jijonat.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/28629864310.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0tuiq0c568mdqtuji1f8755r8c/wolidixujubedaj.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/42422923723.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/118ecc8911bff4bd7f44f5d47d48784f/77613473816.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e8dfb6deb---98153007754.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/36908477890.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/sovuxegolovuzawitejapos.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/petenuwarexavukozu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56092864c---xovadudatalopi.pdfIn PDF document text
    • http://fitviewer.de/files/file/lotejerikowetatu.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/31460000015.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/tozupap.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/79167433379.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/89198481187.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/bbd55a2ab2120d783b7707964acf47e3/denakomowezuzodisip.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f531e359---10673259734.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074746d1979a---20311484032.pdfIn PDF document text
    • https://qigoodteam.com/uploads//files/202108112247538757.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/29112529588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rheumatoid+arthritis+pdf+presentationPDF 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_off0000c431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC431 16592 bytes
SHA-256: 823ec6569485381c1ca6610f1c9c3b81cc11dddb7fa32b7738c5fefcf5c352ae
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10860 bytes
SHA-256: f4cd18f79d71b88b15f7f097f0a143131cf7a4f2bea47a684e61fe80ae01116f