Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01e1a2f52b541b2…

MALICIOUS

PDF

80.9 KB Created: 2021-08-04 21:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a0e1105180bc2235ee95772a68e33b3 SHA-1: 309b0272bde1289b09b69ea20c23090f78ff9327 SHA-256: b01e1a2f52b541b2625e547f98f614d7beac840a929a96bd663cc4161e73ee94
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/44272536044.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2383fcdfb00aba71789dc8cedd0b8e3b/diralaxufopijuruzuzogi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7f8s0k6qum0lhpc6kalhtnkjs4/rumufezukuvegikagono.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/xakiki.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/82840773650.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/safepujokevomu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3b675816955832aa028f4aa667c9949f/xawamokuxonokanugufofe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd58655f06---kufasinijuj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gesaxamupekemeze.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/59109671604.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/nunuwikimupatepidade.pdfIn PDF document text
    • http://mdtrend.hu/files/file/17058831545.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/59012847709.pdfIn PDF document text
    • http://dothi.info/images/files/19275450545.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7694e9af---kavabukemixaxi.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/pediwusiz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722330810bb---pogiborawitufodu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/62340575414.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609930a851de3---vojezemiguvugejozule.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/josesexewem.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/dubakonedafonamir.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3173ec6fbf---rixuxupadukolofubud.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/vufom.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/88754817860.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/89417077115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=donkey+kong+country+3+descargar+gratis+pcPDF 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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 18232 bytes
SHA-256: f258fa3fb47fe8319eaadd3ba7077a5e8d7be32c0e18c980bd461dcd46c6a59a
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 11120 bytes
SHA-256: 660943e4ebfd455f3671ade5fe11459e9652926deb1c2c0189051b117f0f56bc

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