Malicious PDF — malware analysis report

Static analysis result for SHA-256 244e86fdb7b0d84a…

MALICIOUS

PDF

92.8 KB Created: 2021-10-17 17:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57754a92690aff2d7c535a42b6580e10 SHA-1: 0dfba06dd9e66ddd9c1fdbdd57b992c24f19f48e SHA-256: 244e86fdb7b0d84a26d0616dab89c945594f4160083a3b0b03810a39e4e6339f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=holy+chicken+near+me PDF link annotation
    • http://traslochimontalto.it/userfiles/files/78581385541.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/bowelafepagoxa.pdfIn PDF document text
    • https://pu.vienhung.com/webroot/img/files/dimusit.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/magadoxajujariboxipen.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/gojodatowufifonugapa.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/bijotubofi.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/32239647102.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/26190565141.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/279cff791f4f1eda03db75e62d5e600d/salipus.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/29617953348.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/jixevajopipivo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021100615361310.pdfIn PDF document text
    • http://klsele.com/userfiles/file/1633926834.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/kasibobinurugiwakax.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/1689402197.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/jijusiriniveguj.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/59173653698.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/61091680788.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/levopabijuseroralikupa.pdfIn PDF document text
    • http://devveb.net/userfiles/file/23809213001.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/54327551230.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/fudine.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/ruvovupukikixakoke.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161639c347a3c0---junet.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/fuvorofetikopozagivipone.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_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10424 bytes
SHA-256: 597b68c84570f7d5560d69a476e7d55c0ccddfd8b55ab80e301c51c92a5b035d
font_01_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 18724 bytes
SHA-256: 1b54ca4e93fdea65283b2eaa618594335255b380f801bdbafc86533fc83070b5
font_02_sfnt_off00014d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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