Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc32161e9faa06b2…

MALICIOUS

PDF

89.5 KB Created: 2021-07-19 03:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a79ec8b0b8aabd1db0aef69acf3677c4 SHA-1: ce11192cda3c2f039176971f7af8e7bece3ceec2 SHA-256: fc32161e9faa06b2d9e11c04ec0ad8f2fbae5b7700d877d1b4ebf4ee12948d70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mg001.cn/upload_fck/file/2021-6-28/20210628205417202908.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/napekenejipimoziziduwi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee438a1e828---kegirafesozowilewezax.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8c813de9634ea796f8a461524d102bf5/77233217048.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/7374288446.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/svvkvs6stnhpvut0kl3g2an1gf/birotatoxima.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e5dd00bb---34554042047.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c361fd9b213---14596428292.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/sumovulopa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/ronuzopogarikowebofo.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kejuralasezawepu.pdfIn PDF document text
    • https://jagominum.com/contents//files/xugafo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4d558342cb9a244009a7fbc18da15007/99609398883.pdfIn PDF document text
    • http://schokobrunnen.com/idata/29576982316.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/75796772744.pdfIn PDF document text
    • http://talleresjpg.es/img/file/bidazokiguvov.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/poboj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df090052f9---kodoveturoxazerir.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab4f89b037---rurejolapazubotow.pdfIn PDF document text
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076115fafb39---deguxiz.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fc1f5055422240576c4a392907f3134b/jajukuxusavenizat.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/47081656605.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9d7q1tlo6ijac4ah2cthgibda0/8443320282.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/xosugekedudufile.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/mowebega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=top+ballerina+in+the+worldPDF 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_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 17592 bytes
SHA-256: 2aca1532d190cac309272dda948153f5b9464e56e6c4748b6c6866ece9ce6acc
font_01_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 10512 bytes
SHA-256: 72d877108b37304264604085ba4d5f96997a2cb09937469b53861f755b60f601

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