Malicious PDF — malware analysis report

Static analysis result for SHA-256 126cb5c405690750…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 08:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fd526590d6782e943c07aca0122ddaa SHA-1: e5023ab5585c7d363255ed2cfbc042def29a84f9 SHA-256: 126cb5c405690750f230e0a4f605898b20e64060387913670d42f2ac93186c12
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.hydro-tg.pro/upload/file/52265815789.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/fnm21jf8t748s3pje57ira32fa/xavenelikotizefivizunevo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zutevudisem.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/gipewilufiralesudekix.pdfIn PDF document text
    • http://apvn.info/userfiles/file/91714433543.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/66006584929.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/rekoli.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/cc983cb1fc499001cd3baf41436a75cc/51042697585.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210812181811.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f720fc6b2b---42146640057.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/82970438652.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607035b76abec---93661548240.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/93823158707.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/tufibidosuvefalapel.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/mikumazuwasizenapezofikak.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/81660744368.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/wepove.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-28/20210628050159897685.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/87575730825.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/lutawuwodejerabazol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=magnetism+and+matter+class+12+important+questions+pdfPDF 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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 19072 bytes
SHA-256: 25fa0dc308885b17b916360283261f61a5ea59ae1c12071e042ddcc4eab97faf
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 11376 bytes
SHA-256: b5eb290ab6b75df1e360b2079ea16058289b869584d5dc4ac79079297e03a644