Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac34d45044da5bf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 16:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79d4261c9bee77f4a8b65caf5e8a1a9c SHA-1: 6d9d47ddb7f98350a0ad8a1e064167786e566f9d SHA-256: eac34d45044da5bf2d52252310aa77eb32d9f621b0197e0c5d95b70ba22e1ba3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many hosted on disposable domains or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://uralcomservis.ru/crn_fls/crn_files/mexavus.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/35531426047.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac1b6370c---tatazozeworapuxavi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/digeluzimoresekevegoratul.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/tetopeludubawutobu.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/48099140008.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/xomivulajamutuluwux.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pt9k1ive5s3u1r6b51ijbm97o/samixib.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zebakinuzagixapegegit.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/fogimefajumeninetexo.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/97047271694.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/subajalanuwolarupan.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614882a9be2f5---77572629289.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210909233019.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/35317033730.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/demigo.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/96809202239.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/38718227278.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/73666486035.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/zobagirak.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/91230752041.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/fomixu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/letuwumavujami.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219544973078.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bovalagipeworofipota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chal+mera+photo+part+2PDF 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 10304 bytes
SHA-256: fda30749157a480910b338f035bb663465393017e961d5057118046f2c6450e9
font_02_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 17040 bytes
SHA-256: 66d021b07aca3589fa5e579c3f8514f450321f124c4f3322d1250aae9d91df1f