Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28811cb192bf5cd…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 05:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cfd2a9a4803407b9615bdc7a6ff3a11 SHA-1: 428a6cdf4b1a25d82bc8ab49bf3c68080a0d4e79 SHA-256: c28811cb192bf5cd21abc5fe9dbc12d8d703e8863fb471eaa3bace81a5a7b491
224 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains multiple links to compromised WordPress sites and other domains, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of a 'download button' lure and payment redirection lure further supports a financial scam or malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3f784981---39849802476.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/12728798091.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47f7349ed---wobarimub.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ichcdifdh170om9sia91lutn37/lapowab.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/880651220.pdf
    • http://dagmar-e.de/userfiles/file/tigolulupagofoturowop.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/1hbnu195t0c7pkpj4mpr4mij7r/sakidarar.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s4sbuj6oec4afbhl37qtne5kea/9485299115.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/r8bq37ae5efjp4upsl1o3fb06j/nekavedibigob.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804ad237ac---wifomit.pdf
    • https://angkorphotographyguide.com/userfiles/file/baxanizeririgaxezomijapo.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e41c885f864f1c93db806217fe469d4f/74415312301.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16231310133439.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084275433641---mujaguberuragigunimirujon.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/882d7e5ca35d2a681828bbf8d9360021/sopatutudukinenexofin.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090034bdaffb---tizaku.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840ec62d7b1---wodimiwelowa.pdf
    • http://apvn.info/userfiles/file/vigigoluperobuzinezamak.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5299d3fdf3---64249389789.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ad37164494ffa3656590007122e09bbe/loxotixuduxemimake.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7dcae4aa9---12967168827.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f07087d75---6238286765.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/uv725kgesnvg7m50n2qhcgvr55/67681085429.pdf
    • http://randalljroutson.com/clients/44711/File/1703563055.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=new+rich+lifestyle
    • 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_off0000eb5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
font_01_sfnt_off00010374.bin
45e1f45c541986c53116f179865fa3f7f4986c4c5f40f1d8d256a5b136570d81
pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10224 bytes
font_02_sfnt_off00011a96.bin
f40f039aee9e3c2ad16303d9eeb89e6516052f2049ee2f8566123e41e522d86c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 17756 bytes