Malicious PDF — malware analysis report

Static analysis result for SHA-256 a360b29d9abeb967…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 11:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a16d8d101dc4423f5a5417ac18a041e4 SHA-1: 24dbd8b8c36be377aa3148b4b02b509564604aa4 SHA-256: a360b29d9abeb967fd803dc01a38c812a8c0f6cfd29bac115c311dcf1480cd8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate it functions as a link farm, with some links leading to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://020tzs.com/baige/images/userfiles/file/fupewabaranofenov.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/32862211389.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wupifumewotaberal.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/fofogorizinuweredotid.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914011747.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/lavuvikod.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/75328973613.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/supukibetivasixakugum.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/56091563672.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/lexewonaluf.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/mexubasewoxalikaja.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/50068403768.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/76476280681.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8b312ed6---15373334537.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/waveromomudi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7cb3728063c2e43d4e32495032b7e84c/59495847465.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/86294410494.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gasuzabugikikodivibuxo.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/12309995665.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bfe3efb58---108675670.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d35a60c00---pafovefexibu.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/30803137454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=airdroid+premium+hackPDF link annotation
    • 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_off0000b742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 16584 bytes
SHA-256: 1fa7afa7e81b9942cbfbc069652af9df10d8828b640822e4a0020d458a5de8fd
font_02_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10536 bytes
SHA-256: 0aa8ca6e6e79923012a92c8c9be9903e6a7f3402de881c253ea56094a16e8136