Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0e28bafcfe0c9c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 11:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41941343de034a43f5a601f0ffe7dbe1 SHA-1: 8e95bfc3a2d31f994ec569b41a0022471b7f35b9 SHA-256: fa0e28bafcfe0c9c9e34b9a5ee6f97f2e26e4e2774806a287b930dd0601a4cc3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites 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, with the primary attack pattern being the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://semsaesp.com/ckfinder/userfiles/files/xesesexivodujisifuril.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/pibetadaperepalo.pdf
    • http://yasaitogo.com/uploads/files/xonumukogok.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf02e704f---38607432318.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5d29fa33---nemovebiwefawexumebesemun.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/noberuzomifevupazinu.pdf
    • https://koratspring.com/upload/file/12473115704.pdf
    • http://classicalgardenstatues.com/uplds/file/30971646206.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc61fa659d---40588645612.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/cdbd280157a4ebd1d0820fb3852372a8/72976560673.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e0edf1e41---35057833744.pdf
    • https://glbtrader.com/userfiles/file/99543887250.pdf
    • http://jshtextile.com/UserFiles/file///pupinopotefojuke.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f1734cba---62760257004.pdf
    • http://iltorg.ru/upload/file/9271232539.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3870111d4d401c841252f17e035f9b7a/mekafoparoban.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f99ede47b626a2a02e581d6a74eba4d/31307879897.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f4hv6tl7na7qmpd1ahjffobkc7/72936689009.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4f9f6ebab8ae1080956b53c2fbd87156/18263299639.pdf
    • http://mgtofubbq.com/uploads/files/jarenat.pdf
    • https://faceless.me/userfiles/files/jebivozol.pdf
    • https://letstravelforacause.com/miet/assets/files/durovegetefuvut.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/62476d6d5a03a3853e167c9c257a2a48/savunatozitugis.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/50085018675.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=optical+sensors+basics+and+applications+pdf
    • 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_off0000dcf6.bin
2c5912e15457a6a6bca66e3b75c7ea14258cf533e53cdbab80a36f7117ff3553
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10776 bytes
font_01_sfnt_off0000f5b5.bin
2ca3a8497e4f55d90433810d90836402199b8a061797b5a9eb8a83eb1852a676
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 17320 bytes
font_02_sfnt_off0001231f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes