Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a1ffe7040ccae…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 11:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f34b2aad64cc618c1bdfb10cf9abf675 SHA-1: 3e9266977feba7083676cefa975e5949300906b9 SHA-256: ea3a1ffe7040ccae3d5f7dd095a34fbdef4d937fd349496086a47c213c5fc943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hocikto.info/userfiles/file/dubevazi.pdf In PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/24763255593.pdfIn PDF document text
    • http://devveb.net/userfiles/file/56035947858.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4c2c1298---28573873725.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/sidapuvejorinewusadep.pdfIn PDF document text
    • http://yejida.com/userfiles/file/teketekosixepajifi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327ebd4be4c---28654086178.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1fab2e66---navixege.pdfIn PDF document text
    • http://rubensova16.cz/files/file/68263774635.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/68471675837.pdfIn PDF document text
    • http://pileki.com/imgup/file/wolovusiwinugotewosezafu.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/bedadanotemonimitaviba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36c2b424d---43893383914.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/75184263726.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96448533730.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/28532755039.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/vibekusexibopo.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/givovaloka.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/37736584428.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/8571425174.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/1594425387.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/31583267029.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/96046779685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sending+cv+via+email+subjectPDF 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_off0000b962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 16732 bytes
SHA-256: 269f59fff3e7adcba880017529715967dfd175719e23142bded05c47046bdc13
font_01_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 11004 bytes
SHA-256: 8d0460fc04c4981f4fcad455329ee7da62c235f18647226dbf2d6b6d172dda2c