Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8fbc594d84f0a5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 01:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a439644211bbca34568e701d5710291d SHA-1: a219f198b37d6105da681b5e7c012a8310d25ffa SHA-256: ae8fbc594d84f0a53c9df2d90222cf1e946b4bec7d5f17c10edb8f2b64e41661
176 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of numerous unknown URLs supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ybshajiang.com/userfiles/file/2021-09-05/210905203024632580e4knkb595woz.pdf In PDF document text
    • http://kpghomerepairs.com/uploads/image/files/nulogirasadarukimib.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81856747180.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/87355968882.pdfIn PDF document text
    • http://prota.ru/upload/files/nosamelurirotit.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/32843694895.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331701daf3a---fonotivivaji.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/xijilit.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/soposifogikexafegiz.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/23142684383.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6127537fb---buxuvowagazujunemevoz.pdfIn PDF document text
    • http://belv.ru/userfiles/file/tojogu.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/87215238763.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tijujaraxuta.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/6154131821.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/88613808182.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/90148878361.pdfIn PDF document text
    • http://ceroki.com/image/files/91137873630.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3ca7bbfe1cb1b3c4fa7cf425c6402997/62265925304.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/84004187056.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/mifiribajo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/33945206203.pdfIn PDF document text
    • http://www.siposferenc.hu/html/xuber.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/99332948582.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/mutotur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+how+to+transfer+files+to+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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 17284 bytes
SHA-256: a6fb76d9bea8963e7aa6d2224a9e64e503d4b426bb6f890dafc97f54228b2032
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 10784 bytes
SHA-256: 185afccd46a43aedc13cc8cc12fda8fb5eeb163817fb7fe85931e0162e870472
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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