Malicious PDF — malware analysis report

Static analysis result for SHA-256 716f7c03dd9c5616…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 01:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e3141db3c5e620a4404a832aa00172b SHA-1: e838269244567c9241777a4f88d20a91c6b20f36 SHA-256: 716f7c03dd9c5616702727785026560813e1741c85656096b2944480f5f2f462
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=onion+epidermal+cells+pdf PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1d22a3b24959d3fed427e3e00a66da7c/jobadisomoxoxazeg.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbc359b21---punabijonemerorodadasexax.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe11dd1c6---jukajuzaxadelejumudarowi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/32231604496.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98a6d5cc8---pinoboluvuvivenawaf.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/8562302631.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/50659085221.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/juzanijuweru.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f49ead27---budasisuwewe.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c78aa520c256bc94cee70f15f1dee865/vifonuwadovu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/635rvg3fim19ru48sndqopd03s/52259512885.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/nabomezosalafe.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/79992202637.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gejitadekiluneta.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/68433460594.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/82185005324.pdfIn PDF document text
    • http://llux.vn/uploads/files/sezuga.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wiliroguxa.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/89323913153.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/68512912071.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/tomow.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c976f201---ganopelekewiwupewugokopub.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/97e7247d04e5bdb5d6c7c183ccba7801/xojerov.pdfIn PDF document text
    • http://indemo.pl/Image/files/nurajesidejudiminilo.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/tosejemodopomuwikisiko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 10708 bytes
SHA-256: a51a1414ff787db80db95b226f47b25febb91eebee581975631bae16bcf24e59
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 2064 bytes
SHA-256: 46b41152c66239606199adeeb56fa6f0c95586cce1373289504480bb8e1ff93d
font_02_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 14528 bytes
SHA-256: 1f74499062f1505ed73ec65657db698311a809687f46e9b6c0e6a5ac20cfae20
font_03_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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