Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8d6f60e815a3e7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 00:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae24635c09c90740bc3a303551ef5a4a SHA-1: 9ac491af0923681484c2c0007da66328736ba6e3 SHA-256: ae8d6f60e815a3e70850034d66008d2eb443ec862b8d653ab04805d54ef72575
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains or compromised upload storage, suggesting a link farm designed to redirect users to other malicious content. The presence of a link farm and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pinyardim.com/calisma2/files/uploads/79982804830.pdf In PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/levodaralepositimebuj.pdfIn PDF document text
    • http://isvpro.com/custom/files/beranupumewoma.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/vamirakosajesejawito.pdfIn PDF document text
    • http://d-innovation.com/upload/files/kimawevojunaf.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/89353423237.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391588e18e0---xixob.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/15196915451.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/lutonefon.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/nisoxevupupogi.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/60742186584.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oegfs1mr4v662h31v7pn1u0k7f/44104266550.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/bitada.pdfIn PDF document text
    • http://agilesolutions.in/uploads/69882516940.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210916155222.pdfIn PDF document text
    • http://talesma.com/E/file/83595211849.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/01hi9i36rm5p5s7g095oqfbkfv/85966262536.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/sakopefofesodisi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c947f42d41---kijoxitatifuwasijefaf.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/vasemakilewonag.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/ladatizomugawisub.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111101155478.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/11578040001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=youtube+music+premium+mod+apk+download+latest+versionPDF 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 11140 bytes
SHA-256: f22e10fd2524cfe69c51dae1fa03d03e1cb10302de1e0bbc2ee8ab8ad2e15869
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 18484 bytes
SHA-256: 8beb321d64f738511a0e50bb83882f2496926744fb536e3fe3119c69716f6aa4