Malicious PDF — malware analysis report

Static analysis result for SHA-256 892daf261d795993…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 09:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f75ca33633a9b2851dff2711536030e SHA-1: 337dd93162c28542679b6fb1286b40b969485867 SHA-256: 892daf261d7959936c7875f9cfb8791edfcd44a2ac9ce44cf22966d668820eb2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=genetica+de+emery+pdf+gratis PDF link annotation
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890aba7b06c---dumut.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/64697344108.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e50a0746a63---giligudabazimeriradeli.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e864fc20b79ecd97b1d767c9c4889dfb/75183853460.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/355cf2d74dbaae267463be1b5487f611/67623457120.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/noxix.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/49110364901.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1db767496c92992d8e0854dd0110d6fd/lowiludu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087669770bc2---ripetujebavo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc5e56652---xurumiwubu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/55273175196.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e8247eb69d6---soweke.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/kadenep.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/9791067573.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee59f2321db---71150064866.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/90698473450.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13e5dee06b.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/47759451853.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qjrgpn7ngckt4gmc5kuu3p2u8j/goles.pdfIn PDF document text
    • http://markone-tools.com/upload/files/gowovukeguwopeke.pdfIn PDF document text
    • http://vanhacollection.com/images/files/58358990786.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/molalovatak.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/zimofowoxakesexivuzum.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/64624560518.pdfIn PDF document text
    • 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_off0000bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 15996 bytes
SHA-256: e908551a4d5c023725877196cf2b4fb1f6f18438fbd3f433933286c9ccbcf00c
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10948 bytes
SHA-256: 512ed57f37702da623b61b787fff6024b3ba7f26d9ea8ba286c1cb0a29d3ef18
font_02_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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