Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc84aae6a33e872b…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 21:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a37671139b911c4a5b89c4078296844 SHA-1: d9bb8ddcb215a987f565d0e1cd9681f9e4989e7e SHA-256: dc84aae6a33e872bc87be1daf2c8c734fbf491cada1dc9c4f537a8cdc0f0b066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript, though not fully analyzed, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pu4hrs3gjueah4sr3a7p7ge437/lewema.pdf In PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/70929942932.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/pogupabolokomeguwapituni.pdfIn PDF document text
    • http://hodori247.com/uploads/files/38804576866.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/riwijenuzedopu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9f002e1f75c8437b973d4523af65c2db/gerufuzobanup.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c4a43fca---dinukusutizisalofezipiz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f8fe64c0---kutatifedipo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c6b08470---78190288715.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b770abadbb3e253f6f3224c253b17de5/kekigabomuzikidudizonad.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/82373908053.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bonovago.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/wuvefopodugadufevopap.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/40188110599.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210803/files/20210803033135.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5aef61fc2cb71168d745e7b3ebf4bbef/nibovi.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/29410334233.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b908558a74---tawubevilunore.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fojutejuxamup.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/xolipow.pdfIn PDF document text
    • http://vo23.ru/upload/file/55627990942.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/zajoja.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wiwuzowesuwikukapaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=linear+equations+in+one+variable+worksheet+pdf+kutaPDF 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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 21820 bytes
SHA-256: 1c5f0039d2b25ea691e7158fad01afc212561b2bf5a16df002bb78de9c60c235
font_02_sfnt_off00013a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A40 11184 bytes
SHA-256: b3d917de38c4ba0c99363028474e251727f37808d08a399e89310ab062f04a03