Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecabf406e055ad6e…

MALICIOUS

PDF

88.9 KB Created: 2021-09-18 17:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a175be0098ea9e6a38f2cbb338db1342 SHA-1: a35fd4e67b7b13dca573b1dc78e90a5db192007f SHA-256: ecabf406e055ad6e03ef41a109fae8918c35b0ac576d785c4c81a2d9a892ef11
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'download button' lure and numerous embedded URLs pointing to potentially compromised hosting suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the overall structure and heuristic firings strongly indicate it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=full+blast+2+student+book+pdf PDF link annotation
    • http://langeline.com/ckeditor/upload/files/xesilubozapudawalakibu.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/zenigoteroxaribobojew.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656867629d---75376288135.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/76995679581.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tigipugekirajuxewor.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/700f5a9ef339b20690ea461d458b0d2d/pogerozaverowaxawuxe.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/21462334354.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/tewutasojix.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/newulakelejikupezodenixip.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/92405413888.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/xijofivogozuzaluniru.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/94103846614.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145779ac6539---48907753539.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/taponutepaworuzivir.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/rosezudema.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/pomagewujetoruzupeki.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jomewenagukupimew.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zomuwiluruligifodilatux.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/mutegimoriledol.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vofasutawuvi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/nomikepizedolovexebarir.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/96690504460.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/mibozerebutekikiwuno.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/57080838204.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_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10728 bytes
SHA-256: 8059dd37192ab6f06b1346f5d804234f08f87e654fa37ceee932dc02e3107e55
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 19948 bytes
SHA-256: 93a1a620ff5c4ff4ba264b8c3ad6ec16e23077e24d1954acf3d51fc2dcb72e1f

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