Malicious PDF — malware analysis report

Static analysis result for SHA-256 316c27721d6def5d…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 03:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e025dfa007eb11f16a889f8c347bc05 SHA-1: 044db42cc5833ad64814eade188df14fd86bdfa1 SHA-256: 316c27721d6def5d42485873eb629c26fed5713aa00ed091d8d9783b99f17ab8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several pointing to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://stardentalcare.org/userfiles/file/kogis.pdf In PDF document text
    • http://cec-intl.ru/app/webroot/files/file/51297493138.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/65463040664.pdfIn PDF document text
    • https://thepainter.asia/upload/files/12172889831.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/pusakarulikotinid.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/loxaxevof.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/78039906994.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/givipu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb30e3754---33524054655.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/kiromupodamululemer.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/bojifezakolosiwigop.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/27384182085.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5844d8f5fbbb9ca06515911cb371525a/8295131139.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db72827c5---zozowitomejeneru.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/ruzufo.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/93326996548.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/59989701351.pdfIn PDF document text
    • http://japhina.com/upload/file/jaxaragij.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/82768904900.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/41715219403.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/lokufugemobofalinafud.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/belutufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+another+name+for+zucchiniPDF 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_off0000ade1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 10708 bytes
SHA-256: 926962f7138b0e339bc9c773967bc16ddbf4e0edb7d4d84702ce422eb0e48886
font_01_sfnt_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 15192 bytes
SHA-256: 87ade8e53a678eebb51311b4d3a8ddf7e87a8fbd15823d30d0e95aed7bcaec3d
font_02_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1