Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd55091b8ba0e5…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 21:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 617c708adb737cb61c4b498b4b3aa897 SHA-1: 83b1cf790f3d0802121bc866f5ce67ae9fde53b4 SHA-256: 19fd55091b8ba0e5a3b198347287d3fe085e5184412acd0a06ed755460a1f650
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://inwebjor.ru/uplcv?utm_term=creature+3d+full+movie+download+720p+bluray PDF link annotation
    • https://hgb.se/filer/file/vowasosigevudupa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613408907861f---31711689826.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/35351124658.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/zoxuzaluwuva.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/32859720642.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/popozijijirimarinibakutip.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210918080749.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/87777810082.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210921_5CF32EF9AC43BA86.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/91134879834.pdfIn PDF document text
    • http://nemochem.cn/upload/files/kadesejopuvixerakerafufur.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/16604119883.pdfIn PDF document text
    • https://businesslife.com/content/files/vadidumumapomibifodo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889b9ab220---talewarusomub.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/84982604798.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/desosepeliwapukifineluruz.pdfIn PDF document text
    • http://spakimthi.com/upload/files/21388287412.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b305476e68---lekepavejuluwefikol.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e831dbce9---dididadagatosoji.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/10899247635.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/82920284835.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/lebonapiwawumejilik.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d02cc1fa93583b6af14b544daf6fa805/66416390111.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8eab345e9a8787e5cf2d1e8b6aaf2d54/98790284148.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/10964671091.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/saxixorazumi.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_off0000b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 11492 bytes
SHA-256: 2e394ea0e0db2a2b0e4766b4a8b1a429d42631c2366f83eb65b1f2c53d3f6f86
font_01_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 16088 bytes
SHA-256: 3f51be07e017c68675d6bc3a1942383eaa2fa5d2f2efa41be862f86477472df7

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