Malicious PDF — malware analysis report

Static analysis result for SHA-256 317950a59c527635…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 04:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bf2e4d9d683c2fb83b422705b48e406 SHA-1: 6e27f7e4c04b288297437dc3b5545f8665da1358 SHA-256: 317950a59c5276350a0b3a66c3eb66d01eab7eecfd232aac9313e3878ce3d951
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. The primary URL suggests a lure for game downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=god+of+war+1+iso+highly+compressed+for+android PDF link annotation
    • http://countryclaim.cz/userfiles/file/penasubomokunugubipigasu.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/bosatodiderabulabegego.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/kepafekuv.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/rujigamanuge.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/nebiselateramatazoxi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613223cd14961---kuzagafutojipat.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133188f77e10---nagirebadezufepi.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51109019053.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/86354562374.pdfIn PDF document text
    • http://zenkatsu.dk/files/pijoxajovugadenisiroduvi.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/misaxize.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/94685695771.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vuwom.pdfIn PDF document text
    • https://aksusu.com/upload/files/85593684611.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/bidimuwowaxeka.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/saxadovevanujabipimujo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921025739.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/tadofumivasugevogukodar.pdfIn PDF document text
    • http://full814.com/upload/files/vexumim.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/fugipafuwi.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/486ad2.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fc1474f3---25577812991.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/962ffd15dec85117921e20a6e5f56d14/zalabusenofulifuxes.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/vejotefekun.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/sumunibizoru.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/revuxefozilere.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_off0000b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 11260 bytes
SHA-256: c7b4be0275b8dac0dc0b931b902b0979091f89701c4ae5055840ce0fb615430c
font_02_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 14528 bytes
SHA-256: 1a09377b685637556420a10ad248ea8dce772879f33fb2615125c55ef129b4d1

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