Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5b31a7105f6b80…

MALICIOUS

PDF

104.3 KB Created: 2021-09-01 23:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 97e485246b38524433b3a9f2bdfca0b7 SHA-1: 3c82d968a0f5e950a272f4ee1b8270f764782a17 SHA-256: db5b31a7105f6b809c77f4fa4ac7b0b3e4e0bcdd2fcde7906cec6e756bae5ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://synerhu.ru/uplcv?utm_term=epson+h310a+projector+manual PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160849b91131ec---66778667465.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129974e7a64e---52321611767.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/rufaboromulupir.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ap3d9ds1uqdv0bovcc88k2tm7k/voxoporapamidak.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/66e7fad595c140c9a539efe1e81e0811/19530773078.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a07bef6a62d858b2b6d8a576d176ccc7/58676626667.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/8128187998.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161277038d15ef---35128535144.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/34440596841.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092521f7063f---bitiriwadiweda.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094793cb42ec---44154130949.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/fowinarosavefox.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/35a3041b2c06100018c14b958a246513/rutujif.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7193027adb---tuzizemi.pdfIn PDF document text
    • https://binhvi.com/upload/files/lijibizevedafuvaj.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/99411924471.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/74079577921.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a122ec82ba---nidujedutezofoliwuzib.pdfIn PDF document text
    • http://cy2hand.com/userfiles/77512451432.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/kiwupaneso.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f003a8f9c8---tegofugoxiwog.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/rukuvogapoxud.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c96d4572---41308718767.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/43308442888.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79513beda---65228389415.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1f92d33dc---tazadaxebaxi.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/madusasadarolugelasitu.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_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 19356 bytes
SHA-256: 44b00595f8a6b8b7c2b829af8aafa032ed9494f539519cad8a3efd7f7ab9ddb1
font_01_sfnt_off000160d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178EF 11108 bytes
SHA-256: 5a40cd4d79eabe5e3710bc762c91f434771a2295434ace758e03d7866337987c

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