Malicious PDF — malware analysis report

Static analysis result for SHA-256 1719881cc3ea65cf…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 16:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 059e651b679db43fd76fc0b4225e4cf1 SHA-1: 4037e7bfef96b3a1fa982d53440dc3b3436d8265 SHA-256: 1719881cc3ea65cfcc6a21a74093de4ba43be24772b133546af663fb1d463378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external links, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=android+free+video+editor+without+watermark PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681b25b547---77756223204.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xubodoko.pdfIn PDF document text
    • http://birdwatching.sk/media/file/69397727284.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6139036911.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/gidepivadamaguladelix.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/32549693872.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/20493961343.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/53051918565.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zowape.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1a23d955---22464229371.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/pivibozotemuviselosife.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tosurineluzimo.pdfIn PDF document text
    • https://motecx.com/images/file/81100849728.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/61958609931.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af7e3bf3f---detiripababuwesinaruk.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908194759.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pusazimajovawagi.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bijav.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/motopatunizema.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/nubugux.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/42752561854.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/zunazidotemaloloworime.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/xoxutumux.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/fuxipuzejabanataxapogosuv.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 17424 bytes
SHA-256: 205315f0c97f894fcf09a3df9ebfda3a03d631dfb88549fb1a3c636502badcfd
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10732 bytes
SHA-256: 4e9ee303748140618080b5dd12fda969d550409fcde3a25641f3cfd054aec03e
font_02_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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