Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4c790981b85fd3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 17:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e514ebdc2ffc74ec7a627cf2961600b SHA-1: 8877efed1d6ed8762d9ff4990cc2495b4ecbab95 SHA-256: ec4c790981b85fd391f1645a1b2ba6ccc51bf82bb717dee77f7be03e5a621cbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=instagram+crashing+android PDF link annotation
    • https://bunyaminerdemir.com/resimler/files/zewubijokasiku.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nowepoxa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d44d52501---19595732763.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/zuxasuvugarogubilive.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4d57ef2a---nuzowug.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/9583422192.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/furafa.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe7a865a6---55729689979.pdfIn PDF document text
    • https://citronel.com/userfiles/files/witis.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/17940534963.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109041851121036.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/74015987156.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wibilarutedewegovegasobi.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/22453675913.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/42378252209.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/jisedudexoxomuwe.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161321e37ef8bb---85919446290.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411494845e9---mazifanasilem.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/86556184341.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67846986884.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/25477924106.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/gudedesavemivojilam.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/gegenewegaxapumide.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/73662709869.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/sefesetef.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/sebubobupibavemuv.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/63188400986.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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 18820 bytes
SHA-256: ece770d0827d37d4497dc6040dcfa8a3e13e8909caa63b7ef7bd51b1153a92c9
font_02_sfnt_off00013213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 10588 bytes
SHA-256: 6b8dfd34bfb5789e944328dcbd0096e26e20df4b54afbe4ea1d6f39518b77891