Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d5f7e7a88fb845…

MALICIOUS

PDF

80.2 KB Created: 2021-07-08 02:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: addb8a4664d5804cbf831eec4e965709 SHA-1: 6583caa16d8f4f07797ec4046a8f482ac32ed925 SHA-256: 50d5f7e7a88fb845cd6725ca02f8dc78c9a03cc8c11b35aea3a05de43127c466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://queure.ru/uplcv?utm_term=the+dalles+dam+visitor+center PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad9cdba59d---52673985619.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9a7d7bbe1531963212b0934d51b52bd2/mopiwekikofixoto.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/52ef338c5e663403c61c73946a7a09cb/61790604750.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a838cfc8---kikuludoxutuza.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/19545288465.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/47768798500.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88637ad366---5012007228.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hmuagdin3gc9muv7e4rcgru342/59798019254.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/danavimibub.pdfIn PDF document text
    • http://susutour.com/userfile/file/kiminodejoxe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe43d99a5---95710279417.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/61fc59c979b1bc2483cda14864217a5f/75802913779.pdfIn PDF document text
    • https://ivanamihic.com//files/20216251863.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ccd2773cf7b3aefc8a84ca9de52107f8/givagenuxomujosunajazo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/38992386982.pdfIn PDF document text
    • https://belloverde.net/emailer/file/nokarozawineg.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kp2opk29f46s5p5221um3k9093/zabafomowofa.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098478a3b872---kezepaxodomilenonimavoju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/adc1b7b7b5bfd4caa880d12c55093143/towiguwajatefejujojafe.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/30359995058.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab973346bbce330d2adea978c18e7141/9645751015.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb6f26bdc---58204149166.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/lc4td8bbp601dmjva5jsgm7gt6/61555391211.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd75def083---jegotebapigexumup.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kulitatig.pdfIn PDF document text
    • 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 10664 bytes
SHA-256: e89ac023f028e563330223ae68d4234ec1b2db48ed766ea8c27d44bb8c36986a
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 16016 bytes
SHA-256: 7e952ccf2f6e6a0add5d94c16fb6c174852b5570e1e965647f562cf3b69a5f01
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1