Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838389d58c81b6c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 04:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ae6b3e232a9412a647728d81a0f337f SHA-1: 24ba17234704b67026ca2ff0e0405ce5de1f50fb SHA-256: 4838389d58c81b6c1ad82223dfe1cd72f43e1562e603c0e944bce75966cf41c4
154 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF structure and URL distribution align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

Heuristics 5

  • 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
  • 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.majbrno.cz/uploads/files/51057940106.pdf In PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/16297172760.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/4319404798.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134316a6886f---posavokiporefubo.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210910011347.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141149686ffd---vebegujijeragufe.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/faxipajedegopikoda.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/83030048646.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132362824da3---mavuroso.pdfIn PDF document text
    • http://donghotam.com/luutru/files/49643838274.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/10145615463.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210915093242.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/59977895989.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/35014617533.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zibafamamuraguvolo.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/72698834052.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/30889200510.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///wogutik.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/72216728801.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cfa29e427---22362059010.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/22712703226.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/15217686324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=html+mail+hrefPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10080 bytes
SHA-256: 153fcf7b766e6686634709c19b94e8b8a0cb66bf95f682c0671b5bde88d1a9b5
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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