Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ceca9a0324790a…

MALICIOUS

PDF

131.8 KB Created: 2021-07-07 14:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5a83e77a52f60f63084ac05bcaa2d315 SHA-1: 723aaa52159ba9a140d4b3e371d25fde03484fd7 SHA-256: 45ceca9a0324790acf3c0f8a6d33eaab959132860c81c66fd190fafed096f2a1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself appears to be a lure, with the document body being heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://clearpatth.com/userfiles/file/zanulurujibegejuzawo.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/67416315038.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dd17e1c8---86749179788.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a652636afa1---zafofen.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/27978801368.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/bikatalipik.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773f54d271f---videtivi.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/zatedivodipawula.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/pelixala.pdfIn PDF document text
    • http://debden.org/userfiles/file/fezegapafazuvusurinelita.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/puvovis.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db47bb351de---maxasawenajezipajojusoz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9d8ac4ab2393d294e7a64d37aaadc352/gokanodigubikexo.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8323a12c---86270698615.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a7487898cb233c350db8cd47101d728e/59296127060.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be51705d102---7407230541.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sa6emft9otsnd1p7tec499otlu/56367299695.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2a11ff16e192b6782d549808eaa8a50d/zufekabenukotoletuweju.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fakutujomixefubo.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/titikazug.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5163ce1107---8730095594.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nidagowefatilomegimomene.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71d6998b5---bexaponitixepira.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eda975f21---7275961643.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e882af5b---40024534586.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1kuojlvilu8264theud0n3d1bk/5913084820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+spell+school+in+spanishPDF 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_off00019ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF1 19000 bytes
SHA-256: dd78ace4b76e5a93e49eb97442423fd72ecce28c3c0a14f7c7bfa196f47aae6e
font_01_sfnt_off0001d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E92F 10704 bytes
SHA-256: 777f6c5ec88715d3542b14cc6d844412ee6f6f218fb1a4241d465e9c0cb7e217