Malicious PDF — malware analysis report

Static analysis result for SHA-256 4545ada544b954bf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 23:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bcace920844a507c4bb2b88ea4a3508 SHA-1: 62a326b9ac798530ccf4e76a05dea440ee67d793 SHA-256: 4545ada544b954bf41460abeeab7c147f98ae18134f838cd1dad0bc1b9f68c33
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple 'link farm' heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=cast+android+to+ps4 PDF link annotation
    • http://graviroz.hu/ckfinder/userfiles/files/57923103660.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/bojugerub.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/vigaduti.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0818cacb0---karifoxibovoxozapuduzaku.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/tasutu.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/nejoxepenoguvojoron.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/gelamozefelos.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zufalazitet.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/guruz.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/78881096095.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/24256571502.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/5531666376.pdfIn PDF document text
    • https://fasleh.net/Files/files/69338605810.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f5eb1d40---dijubilufaxube.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/19398439809.pdfIn PDF document text
    • https://il-gusto.com/images/file/dunapezoxebidaxorax.pdfIn PDF document text
    • http://sbairs.com/datas/files/63873929923.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mituvitoko.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091119051099050.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pfe94hs95616ilce722lmmbl3o/mibejiboxesipebefeguxulof.pdfIn PDF document text
    • https://majubesar.info/contents/files/92770337272.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/33295500334.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/37937968792.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/83621905190.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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 17292 bytes
SHA-256: 7408bb4c6c37fe1d5f5957db380f8af2c827083d5ec0ad28b164e363fe96292a
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10316 bytes
SHA-256: a7a4fdfb220221866d5eb04fb2ca4d1820ec66a19347551e4fc2e45ad12216a0
font_02_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1