Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eaf82be2e002344…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8608c5d11d6b63c845a994eab9c2a8a7 SHA-1: 4600d0aa0609d94cb6f4963f923c5ae586a7d28b SHA-256: 8eaf82be2e00234418c5acb2bd9203af7b0063d2c7555f74396151beea3c6698
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rentator.com/uploades/fckeditorfile/80027746652.pdf
    • http://candientuvibra.com/images/file/13100397812.pdf
    • http://rracc.com/file_media/file_image/file/fugusotekamawu.pdf
    • http://klaaswester.nl/img/file/wufuzasavabejefugozu.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b18dd2af1b---92757334035.pdf
    • http://myucpb.net/userfiles/file/tijusijipufefes.pdf
    • https://812423.situshoki1.com/contents/files/gesapetoruliwi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613877c60a2d4---55299080372.pdf
    • http://mdknoodles.co/uploads/files/gugagovuzosetan.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399b62005fb---bitafatogoboveb.pdf
    • http://diagnosticaedilizia.com/userfiles/files/palapizotebowinuba.pdf
    • http://abwingssuffolk1.com/uploads/files/pevejupimamufikobav.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/jegunupefewolaxiwulokepug.pdf
    • https://beldapin.com/calisma2/files/uploads/vemimi.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613672218e3b5---kigelusepisux.pdf
    • http://themetamorphoseprogram.com/userfiles/file/lajalepaw.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/95569422348.pdf
    • http://membranekeyboard.de/_data/file/81325898263.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/22562551305.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/40720842182.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25772057879.pdf
    • http://rydelko.pl/userfiles/file/97514565150.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210904_F25E41DD15538CA4.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/25810676232.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+city+building+games+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b122.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 16792 bytes
font_01_sfnt_off0000c939.bin
ae1f285b5bd37d50160702473e3cdb1cc11f83a5deb2a50c3b437857c372839f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 11120 bytes
font_02_sfnt_off0000e2ff.bin
3105b2ec46f3896a530a66537f664f29d27eba2c044c9cfab7fce16bd84aa509
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 17032 bytes