Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f36f98be9911dc4…

MALICIOUS

PDF

90.8 KB Created: 2021-07-24 19:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa93b2499561ce5ffe22f9b5a3a4cc97 SHA-1: b8c0bcc7e2df601baa36c9a89c27e4d17f68e3c6 SHA-256: 8f36f98be9911dc4f6b7e032117d3d8e3855b300fd928bc48beba5b325830640
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute traffic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://artasedanasingaraja.com/uploadfck/file/wejeradobelabidixupex.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae26f1b0f---xuwatizavopeloxorenowa.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/9ffe1bb78317a7057e1932f80e42e2e8/17584743570.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/e97d3p3mnmh6l1jcd33rnj7knp/zinetozor.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3f3a1cb130e596a1691a84b9ad669279/dopijevugigowa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/qd0dk5qr63n3j68qtcauvf95hk/luvumaxadavif.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3485e0b87977647c97e50cdc71c414ed/20035831748.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b91f20e2---11992413004.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/39950212424.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/93a8da28744fdc043c7680a644b8e550/62361042805.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0346f4687fec98aaac9fde6d12581450/13553345701.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609045cf8ffb4---kuboposubalexixibib.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/delulidobuvatuju.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2b5dc564fac9c6ccd3ae5ea1435707e0/85743339646.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/c3cogrhlrst922kufu6o8hnlh5/26129601089.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/93819558743.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/17699417365.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kujupifogetoduk.pdfIn PDF document text
    • https://unitjaya.com/contents//files/lujupowopebegepusowebut.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd744308c---26058238054.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b76bc51f6---nofodedogonit.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af958f1f544---58458918603.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/90033854395.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jasusekubuw.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/peratobojafowosixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+steelseries+nimbus+to+apple+tvPDF 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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 17812 bytes
SHA-256: a627ddb09bd2e330b381909dbbd0df2aab25ce9952db59c0a0f501a35d48a234
font_01_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14430 10916 bytes
SHA-256: b30dde2b33185a138b93455473d90a7e44e70e82779bbf2a3603ee786b64e422