Malicious PDF — malware analysis report

Static analysis result for SHA-256 98595a900fdd8ce5…

MALICIOUS

PDF

148.8 KB Created: 2021-08-17 21:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df23bc58a151cf7dd2fcf8680929f17e SHA-1: eda1a2ef94308ed616739588b682abc645374adf SHA-256: 98595a900fdd8ce57597e6a87c4211e672f2a5c9ee3ba945db73d7b1555fb4b6
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7751

Heuristics 5

  • 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
  • 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.zywawiara.pl/pliki/lutimefosodulinefurisala.pdf In PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/27177779085.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/fexonipiwibamazam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uqocb1hn4lhqe3fb9rerq6a1m7/53292827020.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/30717535693.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/luzudaliratidar.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/sadudegexasix.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/45407369240.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e2a5a48b75401aca8da4f2df46f40d47/25969424884.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f24b108734d1e5754ffbcf37db6324a1/91514446477.pdfIn PDF document text
    • http://vladekoservis.ru/files/55907502420.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7f7cf0b4f5486c820d52b9d05bf2a1bc/zatekurujusabasipurexinil.pdfIn PDF document text
    • https://eetravel.net/file/74529670116.pdfIn PDF document text
    • https://begili.com/uploads/image/files/25182458116.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/32128511343.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/933748a5bdb59e183b1f39c7b187513d/8432116940.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/39837688480.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a321356008f---83779231312.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/40bg2lhkcg3p7k5ljn0r2sl5vm/17660200299.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094177d66c6b---65638823163.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/gudofafifilotar.pdfIn PDF document text
    • https://actor-conseil.com/files/file/1524159186.pdfIn PDF document text
    • https://ekransamara.ru/files/14030853340.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/85c8897c6efefff892a1d3f6a721b1e8/73853644913.pdfIn PDF document text
    • http://ashioke.com/images/library/File/64553357249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fire+emblem+three+houses+edelgard+romance+guidePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22548 11032 bytes
SHA-256: ddc91c1d9d4ebfd70747594f2453e300e40fe489c453eb6b7fa16aea4f359999