Malicious PDF — malware analysis report

Static analysis result for SHA-256 997164d1510f532e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 02:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80ab36c4d95aca9701db2077d714092a SHA-1: 76b47f03944f5c240779ff1b9f071047026e9ff4 SHA-256: 997164d1510f532e6ef07c25d08c0746569fe149437cc760d4ed9e16fca7c628
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple links to potentially compromised WordPress uploads suggests an attempt to leverage existing infrastructure for malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://quaint-house.com/images/blog/file/dibububuwiruvi.pdf In PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/32358364836.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac6f3b569---vasivibagikovo.pdfIn PDF document text
    • http://sgpeo.pl/users/file/rigakulu.pdfIn PDF document text
    • http://ministerium.pt/files/67493334091.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/28348462183.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/galutokep.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pataler.pdfIn PDF document text
    • http://jadeite.ru/images/file/pejubukujiwopobadozetewo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kl0780kfuiapfukkfac7k47n20/wisujefolipepiv.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/10686476338.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b8db1586---73574511927.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/39831791481.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/51081973920.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/82520443766.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/6079945258.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/15409116127.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/segixopakuwijuxudamimita.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/renofuboxenavune.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/diwuzujuzif.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f36e3941---mozaw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebeede7dfc---45765044080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=avakin+life+unlimited+avacoins+2020+apkPDF 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 19132 bytes
SHA-256: 1a322d211b0bfb9652095718756f7ceb00ec8d3b6ea4d57f949627a3f149adb8
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 11160 bytes
SHA-256: 95a07e2f2404b7f1aae41ab5cadf2809536b88d96eb0380ef900edd20c09f213

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