Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611fef4e774d9b2…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 07:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 295afa0e46e372358f1f1ac3cb5153aa SHA-1: f2993933a6c9593a88504daa01bd987b919db8d0 SHA-256: f611fef4e774d9b2c1f7e6aee17f169bde14cfe519fe6679c571f3a264e3f693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bloomland.com/sites/bloomland.com/files/79656650526.pdf In PDF document text
    • http://indigobaby.eu/upload/files/temalenomud.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/69452397652.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/81500553240.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zinilojitobij.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7adda80c3---xowefifevanigapeje.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/muxerefemineguwex.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/49151502900.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c29b392c---71683551549.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608df05699ab8---86211975332.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/20757156548.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b052e1457f7---57663545254.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/momisukapusuwuxugiguzew.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/nubizabulawavik.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/momuvowofalosupuwagof.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/30459026682.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vipmlksiqqpcdrveisojaf3sls/xeferumepikitizabalozetug.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/70894457291.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f01a9798e00---94764296055.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/fodejasevutaradizasepufum.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c91a4075957cd6027e1afeb64ac0c2ef/32709655283.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13e8929af6---lavogejawakirabipam.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/r7mtn0g7vd60g91hno5ginm554/xavuma.pdfIn PDF document text
    • http://whatdwellswithin.com/file/43783482888.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/kemebazakosufovakux.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071904aadf28---repelowevifufaxitana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=clippers+schedule+2018-19+pdfPDF 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_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 20236 bytes
SHA-256: 96d94dd044eea732e6523bc3ba391b4fb32a30f1c910632d345b148fcf9450bc
font_02_sfnt_off00015148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15148 11068 bytes
SHA-256: 9af10f50a39bd18c6f25b12d10734bfb04498bac4fc16bc75dbaa26e6d0577ce