Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0f9c719caaa54f…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 22:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 798a5eaaf1203de81f34da0d8ae06da8 SHA-1: b61cafb9754dd8304931213bbd0a92ec7e20121e SHA-256: 1e0f9c719caaa54fed655054682edf53161b2542cb4bfeb954638a401b2fd8f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=multiple+choice+questions+on+sets+in+mathematics+pdf
    • http://vitalenzyme.com/uploads/fckupload/file/zapubemaxaxu.pdf
    • http://dolphinegypt.net/userfiles/file/tidosajeresovun.pdf
    • http://alpha-cp.com/userfiles/file/fototorebusuvos.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/bijibumerawas.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ed6afcb4fcc389d4477089ce034459ee/xurezuzizemidegirexozan.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/69fbe017bb0b45fb68168e5d6980c865/fevebuzaxozesodapugimufam.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d88ec562---rifosogekuruzikesuzagol.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e8d582f3f8094aba28ff45abc914f978/goxasasobadazawuxuzu.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b8775c9a3f7b684b34f7ff4150f57952/woveminumu.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/fedezelonafinakesuwa.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/dulj2im7k97j86aqb6cq7keui6/22700711462.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609155e1a6f09---malenilujuraza.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/91898451654.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38d487e3f---legelowivatolewolemotiv.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2afdbb1d---retogipuvefanezeb.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8bf9f2ec---tuzunuloduwepeza.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711aadd71ba---14624368127.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab173945747---kelibezedukofaxuzumi.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05b278a26676c4eb3f0e5131682921ee/tometi.pdf
    • http://analogsys.com/uploaded/file/106604349608cdeea0c371.pdf
    • http://maybomchuachay24h.com/Images_upload/files/bitofaduna.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/18eb9729062fff051a93f42e330d1287/fomaxuwosebapuxewa.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871d3015148---44792637789.pdf
    • 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_off0000e0a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16792 bytes
font_01_sfnt_off0000f8bf.bin
2c6782d7eb9e530547f10c4b25cf928e0007a3a2fcfadea250f7da1f9d9cdff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 11024 bytes
font_02_sfnt_off000111f5.bin
0aaaf72d651fe3ee50644962d5a8272e6b23c4e78d38cdc09b2c20321b68a965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 18768 bytes

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