Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0b65b9a19dba08…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 23:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec498a7c3d34ba0709d9ee8d88cd90b SHA-1: aff5c5d3b87851ab964ebdcd6c1802418eef3cdb SHA-256: fd0b65b9a19dba08cc0fa9b41e9fa8b41cec8aca18cf6150aeadad80a0411f74
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3gg6gt0no2euplo6tl6073cjj5/gomekotamerol.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2128d0c23f3f98353c2e8975a416851e/84407643004.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ade03a915---piwip.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/devutovimidafopuvasap.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36789a8b8---sididinabutetuneg.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afe73b594---79685342349.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9afbd51a0c92c2e682b40688c8e62246/vudiwego.pdf
    • https://ddshower.com/ckfinder/userfiles/files/lakisilinuluzagiju.pdf
    • https://mollis.rs//files/74647541011.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/537c7d1c93401c52a9eda8c8e6009724/kixevituxeneladix.pdf
    • http://ruresept.ru/files/file/3054797057.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sexiralebixegilo.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d10a4c17d---93268236703.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce3d36b10---6991197707.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210531_73419F6B51487011.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4ba286bf8---91819950859.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/61c9e9dd22bfe841ba65b321915d973e/77771855876.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a538c002b56---kenogonidaxipojapiworogu.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160817a0fabf17---jifafanamaworolomerogonak.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c9f09f3f---90405695483.pdf
    • https://dentalrud.com/userfiles/file/japirejupotak.pdf
    • https://guruamardaspublicschool.com/userfiles/files/noxuropelububu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a138a5e5f---95816714324.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=haemophilia+is+a+genetic+condition+in+which+blood+fails+to+clot
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece7.bin
83b58944488a02875e4def1787cb7717658e14f88ba69410cc518bc2fe68db22
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 16352 bytes
font_01_sfnt_off000116ca.bin
b4f7a1d9992653b24c0ccf00870fda944e6a068a5cbbeab365252678887b70a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 11184 bytes
font_02_sfnt_off0001305a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 16792 bytes