Malicious PDF — malware analysis report

Static analysis result for SHA-256 60601310fdd1bfec…

MALICIOUS

PDF

78.9 KB Created: 2021-09-26 09:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fd82c94663fd1463fc7b106dcb56341 SHA-1: 068fccf761a6572ab9be07ffa0cd157a5202ed83 SHA-256: 60601310fdd1bfec5400b176e6fafc2b8bcb2358f170006bf778c7ee99c48225
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=descargar+i+nigma+para+android
    • https://vico-real-estate.com/ckfinder/userfiles/files/63732795100.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614916e388dcb---29967882788.pdf
    • https://transmar.biz/ckfinder/userfiles/files/datidazozesi.pdf
    • http://5thaveseniors.org/userfiles/file/47324131437.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/77126341241.pdf
    • http://porpora.group/imagenes/imagenes_contenidos///32383732168.pdf
    • http://birnagarcollege.in/userfiles/file/10928543772.pdf
    • http://maivietnamesecotati.com/uploads/files/pedamimixizusorizomezoxib.pdf
    • https://anup.bo/images/files/nokafivaritaziniforakaj.pdf
    • http://srividyaastrology.com/userfiles/file/56649245373.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613238a2b8048---gorixoxulezazopuzololig.pdf
    • https://soudurelauziere.ca/upload/editor/file/bajarerijurejinek.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/80856682261.pdf
    • https://cursosadistanciayonline.com/medios/files/wonuwebajofifimosesiporif.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/98927254438.pdf
    • https://gites-les-bardots.com/userfiles/file/7157799524.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/takotudadonowi.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf4809fbec---vufofevuxaguvapofuzi.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/gujogamupagagej.pdf
    • http://ecolservizinettuno.com/userfiles/files/56590393016.pdf
    • https://bellcera.60km.com/upload/files/16727973016.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d8a547b3d97033f54582b20817124f3e/68029269241.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/72068755238.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c806.bin
dceb5808a2c348c4bc6d4d3e922ab88694f7c905aaf53447fa2528c21abc6ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 10712 bytes
font_01_sfnt_off0000e061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
font_02_sfnt_off0000f873.bin
79db9a7b4163fd90ff1abc60ee3b411520d2e15e4cc368b952dd5b1e83733d21
pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 19376 bytes