Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36f8b5a101be585…

MALICIOUS

PDF

89.1 KB Created: 2021-07-27 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 08700e14191e0e048bdefa9edec1f855 SHA-1: 0bc57137c48a59654faa3d8a58a79881ff4eecc2 SHA-256: d36f8b5a101be58552047edaea978ea9f2a82f460a89e69a51eeda5c681521c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure. While no scripts were directly extracted, the presence of embedded URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cc19db17c7adac126ee2ee060d6b6c99/88525807808.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c596563fa21---suxanagitos.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/83674759855.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/pokotunapab.pdfIn PDF document text
    • http://balone.net/_upload/file///48951550677.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/14678b204df0cd8ac020010affca9fe8/13589409310.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/godeleralugulavulefuk.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e5e70bc5---jubafopuxajefuxo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa25a5adf---29042500777.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabf0dae44---vobusipizonubedagi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m4g4jcaqhnkfi8mnqk14rt58cq/tupovetijom.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1696659b44---menalodazexi.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/dujodedu.pdfIn PDF document text
    • https://bselink.com/userfiles/file/55074834461.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/17359286739.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3botli5bmms5mmlh42sro7s7jj/bexarinilinafij.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210630003403.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/rasuzudazof.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/janube.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ab343a7e---gowibawopobumozison.pdfIn PDF document text
    • http://cycling-software.com/files/file/ruwamuvatak.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jaluka.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kulutezuxagukedone.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f22976bfa5e832b5956a05f705e64060/11239933543.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/pilawikutebixiri.pdfIn PDF document text
    • https://limmaginebistrot.com/file/zoduzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+use+the+tanning+beds+at+planet+fitnessPDF 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_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 17136 bytes
SHA-256: 01dd7c780394ec7a226a4e157f361de2a272bf955b21452d5f0f64226b7d8eca
font_01_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 11108 bytes
SHA-256: a9fb98976f5715683e4acc9c281fd55b5e812957040b3a8045cbc64d3da7e996

Open this report in the interactive analyzer, or submit your own file for analysis.