Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7fdb3f29d5470e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 18:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83a69c4ddf1313791053def285f0b205 SHA-1: 15c3e7624c2cc6f561e64c8704a5b2951c627bad SHA-256: ae7fdb3f29d5470efef6cd8b5ae44039817596965efee9e80f39ec97114f15e4
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7930396f---74418414445.pdf In PDF document text
    • https://ihotel2b.com/upfiles/editor/files/21126782723.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/32335446415.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/leropawizipiboji.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/42155826079.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mojorik.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/53083105789.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/40025951954.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/3168413033.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/42244790818.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/39810077576.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/93090165190.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/64873219018.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/tipegukeserivivibo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/37380332132.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/81469432491.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/vazam.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/65015774661.pdfIn PDF document text
    • http://prompol.com/media/file/xafibutegupa.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/mutomesubowovononebogore.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/34424286166.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210903155826_aof4gc.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e1ff1491e3d8bae5df9b83dca2a58fd/zonifiwozujanaw.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vujuzafujizemawalume.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138085423d38---75812018577.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/97452504896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=to+transfer+data+from+android+to+androidPDF 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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10432 bytes
SHA-256: 97defcd06e469233a793a3c076d5b6ddc04402f3e2975f76d85ae8f595a05e93
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 17564 bytes
SHA-256: 02588f42acc62407525baa57c9af6c565efa68c561a2d987d82292a44202d790