Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae70da7f4581c4ec…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 21:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0796d13d6f0d097bbc56d04479df9d71 SHA-1: db1ae4de9d615d8443e349a3a332615520e7fa8b SHA-256: ae70da7f4581c4ec7c73a87f61dc41727e0981d1fe92262a13cee72f6321fbd1
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and is identified as a link farm hosted on compromised WordPress sites and disposable domains. The primary attack pattern involves directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://queure.ru/uplcv?utm_term=how+do+i+email+a+text+conversation+from+my+android PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e2270c8d---93603961305.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613518595e898---52263278199.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nipemifolekujudud.pdfIn PDF document text
    • https://bczenekar.hu/files/file/niwamutazuzejejifax.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/somezazepin.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/39994756549.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/tujejibuwizepu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4limd0iar20ggm4bb4cnnsfprv/47423328265.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/vilinejemerumiligovexe.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/pefakobaruvosuwu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/sekewuxepopuvozeno.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/limiso.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/tafedomikiveko.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nisosi.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/1737040101.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/malaxajumitojutaf.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/70109404920.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/xuvezej.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18289133472.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/15958899494.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338252d68a4---nedufugexovesigiferi.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lojuvilukabazimunusekat.pdfIn PDF document text
    • 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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 18336 bytes
SHA-256: 0a86af47e614a6c06eb334b928731e545ed9efa172f2ea1136183ecdb8412fcb
font_02_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 10996 bytes
SHA-256: 77c983c0d05022e028b745e8603e4599e6f206a82753c587a5163f04f1f7b327

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