Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65841d865fd3e8e…

MALICIOUS

PDF

81.2 KB Created: 2021-06-05 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d4574a0c9afb51d979d7987e5c206f47 SHA-1: c722c6b0353735242a591f59b085fa344dace11b SHA-256: e65841d865fd3e8e74d242f13b29541078d93dca47bbb9defa681f3d4d0ed567
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=carta+para+una+sobrina+quincea%25C3%25B1era PDF link annotation
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4bf1e8c3010af435ad3d3b657f920cc5/ramiteluwu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wefukavudigexogizijinamuf.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q5dt436p55bml2i86p27rqee74/zixulokapuje.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc9d68882---simufakamewofo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vajuridojixobagonevo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kn8f8s9ngjko9ril92t398p1vg/lixasimulosal.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210520073318.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/628cadc5e3d5672cb0e51cac1bef9765/jabadinakenizavuvo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/g71al4428kaca8l9ns3on7dsmv/xokibejetugefewolafo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/64125455308.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/edb5b1b7838dce6592fe3fa417309473/fuvenipizokeretev.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/75344349691.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94a928d28---favaravula.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e1640978d---bezezenofowopuxejubo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16089954d4a5da---64535726989.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b1fa290a---90323777564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 5276 bytes
SHA-256: ccdaaf10843092c6f8de1103d8e18ad885f7b6eba40f938174819c4b39ddcd42
font_02_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 11472 bytes
SHA-256: 6f08ce91ffd0fb7cd421efeec5010d8812b5015d071591ae4fd73fab3aa51f34