Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac0226fd6943e9b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 20:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0fa24081a5fb8eabaf01ff0b00c9a9e0 SHA-1: 0b0a209f7b48bbc9ec3de422087c71d245937691 SHA-256: dac0226fd6943e9ba05e542254940f24f779e23abb8bdf696a113c11a70c00b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ablerexthailand.com/userfiles/files/32301829501.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613003fc01db9---gowemudezim.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/47167764665.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/sipufunolobunemafuveful.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/pimasepamarodugodapuzepa.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/88057150296.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/saif5p76ag4h5s0oeqivfukjub/23990708139.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a7hmu017n2gfsd8lovoqh3c187/59348350088.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614424652fcd4---11337031430.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/63193455485.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/11558525000.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/xezaladigunonifula.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133216fe6d35---10097508245.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389420ea15f---97681916142.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/48337977735.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/gusebede.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210917115149.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/86092982466.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sotorez.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/porigodi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/63083775363.pdfIn PDF document text
    • https://akemi.ro/hirek/file/75495118809.pdfIn PDF document text
    • https://gangnampools.com/contents/files/xinevekate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=metasploit+termux+no+rootPDF 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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 10608 bytes
SHA-256: d151110a7adfa0e68d984887d495d53d20d2d5b5388939dc765b67d21fe15dc8
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 18468 bytes
SHA-256: 56824ee4c2e837aae7955858b9f1ef5ed2b37e70e31f50290bf7e70b65d4b8d1
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1