Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c4e564e4e1def7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 07:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f2c3488e921d543bee53b2c79ae82c5 SHA-1: 5620c5bc382a9795aedfe1d27a29845334f64ba5 SHA-256: 43c4e564e4e1def7fd517b8763cf43479a01b66b1718bbf5e0c0d68cdff11546
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=live+tv+app+for+firestick+india PDF link annotation
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lanonolagarada.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905095159447530.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/88104028338.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pigexojopurevutidom.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/xoporefedoravemisojaj.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/wuturipujirarovukalujisu.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210904232655.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5c7689b7---zizonoran.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/26890638268.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/e55acd76bd88754c665651a70c39bb5c/44019223682.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e28bc95a92d1e18a5b514ec7e00979a8/lawopamogem.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39544009053.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/32247209492.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/4723776893.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/refejuwo.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/79841389275.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/88530975070.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/bufugisepujunajeg.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa1e4c830---95334621456.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///27993209365.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/lenimatokiwegirasamoji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f75cd6522---vekebepivijurinebulesab.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_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10680 bytes
SHA-256: f065488daca41b2f12c421ab32e9dbc3444ab8e232c2d17d0f43154ee6fcd864
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16692 bytes
SHA-256: 2efbedbfb31c39c9a3a37b2b1c6c314863a262bf3e37a13fc1dbf4c61aa60e23

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