Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bde24289c652d77…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 22:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0874800f82a08cfff7864c94724291b4 SHA-1: 8dbc9a0cf5f45bb4a943262a7275b0a2641f3b9e SHA-256: 1bde24289c652d7770c86f3dc65f69728a5a29fef46eabc75577af36b4a7ce56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=think+slow+think+fast+pdf PDF link annotation
    • http://www.farnostbobrova.cz/ckfinder/files/27046039806.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wodazenalavapuvadaliwapa.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/30873724488.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/81079073684.pdfIn PDF document text
    • https://digireg.gr/upload/jojefupalexamomakogegusu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613659354468f---duxowitewukuvi.pdfIn PDF document text
    • https://coevent.ru/upload/files/dorojakexiduxawoxowol.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb80f405d---91604225293.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161387cdaaeb2b---bovule.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/kixanojomovusanop.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/61767578288.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/2156188788.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70019851238.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fonejitoruj.pdfIn PDF document text
    • http://denge.aero/upload/files/weluwovamelik.pdfIn PDF document text
    • http://pedraferro.com/files/files/niwusidini.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tumiridapog.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/kagotifufejej.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/74455537726.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc48a41c57---33887454161.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/68092951053.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/7589116504.pdfIn PDF document text
    • http://vce34.ru/attachments/file/jopag.pdfIn PDF document text
    • http://ipceurope.be/assets/file/jimizirubet.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911140310.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 17940 bytes
SHA-256: 0086d0f42087209e6fb50578526a12b3e8f055c5bb615cee246987b6399e76ac
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 10504 bytes
SHA-256: bdee7c518b354b59a3c134b78d2172fd9caa5de0c988f5a0737f44df462bbbca

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