Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71611fbb0d6fc46…

MALICIOUS

PDF

85.0 KB Created: 2021-07-20 02:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af6500d34259eff6f04da560edcd4a17 SHA-1: f46bcb6a04d4d5b78fb85442457f1c90c2e1d327 SHA-256: a71611fbb0d6fc468b3b46da7a3db416d618419e32a1a9cd5ce1f863bf3ff44a
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://auto-rujo.com/images-editor/file/39993916289.pdf In PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/wejeradobelabidixupex.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/pg16kaer4fk3spnett0q1sub0t/43397539325.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23e81eb27---82384957607.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/89205724919.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bfk88sir8bh7ndnvpip6k4nns3/62088153565.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/063fd5b41ee749de4fd5fa210e114bea/gutoredegoxezefekojeda.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/pelezegazowesabeteberato.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ekbn7jti94gjaokjrrd5otm304/jisam.pdfIn PDF document text
    • http://22743333.com/userfiles/files/4623609020.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b693cef09e89244d196e0eaf94c59b30/zuzawukojosobigovasovado.pdfIn PDF document text
    • https://nadamasristorante.it/file/ramakoz.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/xixuzeb.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdb59601f---52977756142.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877d2261ccb---72087041235.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/dodaveluxubux.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/42394315565.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/20735390599.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/26341991245.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5af3c8c8d2aad73b3ca19425803fd118/ratibipegen.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/xaxokelewilazoxunusemep.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7d1d0682---vivasat.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/92339948636.pdfIn PDF document text
    • http://siembra.me/uploads/files/6709406295.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/risowowaga.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kifemuzimajoronupudena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=paternity+leave+army+2020PDF 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_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 10404 bytes
SHA-256: f2a63738e6a213248757f0d6f8d321716b56cdfb9cdd60a481a52e42468f2212
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16432 bytes
SHA-256: c04e3923c92edafcdb54e5a79dbc19cf84cac2a69081f13aeca405eecd85db4a