Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50d55fe337adf53…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 15:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fad38ffaeb6dbdf56af95e2ae449797f SHA-1: 83df1deeeaec1762728246ef9079fb9899b798b4 SHA-256: d50d55fe337adf53c31002d3344403b1e41060a3a7318948ed9638df322d0405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, so the primary attack vector is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b1913acd---tububebigotupifisulob.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5mc8v17eassvi6lfrbpgerl4c5/kelizozojuviparutazovuzo.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8d9c75b87728c28c7e8171f8029ee6a7/22492271069.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a7d82cfb2---funivaf.pdf
    • https://businesslife.com/content/file/54014750850.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a74552b1161---zevanesepunubugevi.pdf
    • http://ngor2-3.com/file_media/file_image/file/fosivinakebizes.pdf
    • http://akcjonariusz.com/UserFiles/file/vateradezavisabapa.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/89a3779ee99bd9ea30846fec66b114ec/lawobewemafizogenanev.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5adb93380b050691c5ab4a6c9a108149/20235048358.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/71b4d12f22191f1b4d7c88fe43617b97/ditujez.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160991cdf50093---88516401885.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607561abc59ae---31072843360.pdf
    • http://travelci.ru/ckfinder/userfiles/files/95245027381.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/350c9ee94ff2c108e9a5afa1bf7386d8/23010963704.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f847599f---97540912004.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb41e24a82---23952284623.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbaa8b589c---tokuwa.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e426e838---13936580788.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a3d6efc7---112712108.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762856d68d9---jonem.pdf
    • http://ndt-tl.ru/upload/file/87118725299.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=us+clothing+size+to+aus
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1e.bin
c2d49df7708dbf31b64b226d0afcea432f956b8c72cf9f5e5c566ea2ad343b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 17276 bytes
font_01_sfnt_off00011866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
font_02_sfnt_off0001307d.bin
b80c5cfd4da8d380ba0ccb799584cfefa9f8a37d7cd93377fdb526a47444c7e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 10576 bytes