Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6d98e69bdd636e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 03:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 740a752f6563671ebe54ec2f777dcc83 SHA-1: 7a6052522271422e8f704b83da0ac3070e4ee6d2 SHA-256: aa6d98e69bdd636ecc71ddbebdc5f39bbee2e0604a037985b3d1ee345222f381
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://distributoram.com/files/file/47476710959.pdf In PDF document text
    • https://kund-in.com/userfiles/file/95849833636.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/titakume.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zevejapuzobevisa.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/5014685305.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/sunif.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/04rmo3f5dm1re74rg4i7qep1he/19661880440.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/81f3185afef9a6105a7713ce6463fcb3/jidikuzelu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b19b997a---29658838938.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5f8a8186---27482708234.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/wabuneluzofotijasopo.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/wogumuroxuxivoxawarapu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b240c8c---xiwuvozabami.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/wolategasugabemiwolam.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/116051344.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/eea99285c6245bdf5d7f38ad63fe47aa/17044266277.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/16662715550.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/51789231859.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/70565991781.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/84228724401.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210618075831_iva4bc.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/52681021765.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e0875834---gizipelifipusimemimum.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429732ba3---pusowiwanibefimakapemenex.pdfIn PDF document text
    • http://riversedgefm.com/files/file/74222325205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=our+place+bar+and+grill+menuPDF 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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 17300 bytes
SHA-256: 1c6bfaf5f7906789b4d4b7026e4df9a9282a0ac9b646f5da12921b8572a8f856
font_02_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10736 bytes
SHA-256: c56d14044cc59194107aeb022a0f0974d2722c5c7fe2a36753f6837f65c5d300

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