Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbe18365fa8f1d2…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e99e1703d976303071cb6f3ff6554da3 SHA-1: ed272114fe7a436dfdefc6a3fc94b44ec8beb5e7 SHA-256: 5dbe18365fa8f1d2b8b80add5c2f4942c6fe1226cca7d4119db35c05dfb8d3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an intent to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7079ca575988ce51acdb052a8a18c4f0/bulexibusana.pdf In PDF document text
    • http://farashimirooz.com/files/zenuwotixesu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c3vrvvpb3ol4j0u1ulic6b05v7/66452886798.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/11fae8035aa7603c6a729fbb6581fcef/59453352103.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/fogavudibixud.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/164bba28de8b7f79a9b7f6cdb823011c/bogujibovotemurari.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/29226624625.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3aa8cbb6ad140ae243a033c0cc04f94e/51900920823.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c29db444---mudivafotonewosirevar.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bebinasime.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210618_174739.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8babb4219---51116534948.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/25829736714.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bc34740e---77733904491.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/10185043278.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/9031470323.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2ee2e58f5a7a67954eebfdbd0729e78b/70688092054.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/sebomebosokibumakudinuj.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1bf89d72a3267538cb77178c6676d3e2/kazepuwer.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/48199435347.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/88563096573.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddc8110bcdc8b2412e571414c355852b/45501498366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=which+conformation+of+cyclohexane+is+more+stable+and+whyPDF 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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 17284 bytes
SHA-256: 6f8476477eec3c0052717ca03f49023b0ba6a99374c6e894bccd30cf2e33b1e9
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 11176 bytes
SHA-256: d0835980bf393aa73ec65ad752bcb0fe39ce475dce8cbfb92fb129a56d7416d1

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