Malicious PDF — malware analysis report

Static analysis result for SHA-256 b529345b9d2a590e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 07:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 635a242eb63d90c05fe3e23d438c8c93 SHA-1: 41c042e4321697b64b633b93848192ed30c4a961 SHA-256: b529345b9d2a590eaa3c4fec86f8b4d80f6277be81c41a4df37560c83b17cdbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=pokemon+typing+adventure+rom PDF link annotation
    • https://estatecambodia.com/htdocs/cljr/data/files/78491882197.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d2ef366f---kafagoxi.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/pipivararixajobetoganavu.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/81081768567.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/legijowanul.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9e25af557---dunoporepometodoratogamov.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/96311927195.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/89435572484.pdfIn PDF document text
    • http://asja.ua/userfiles/file/xepaxazakadivolalulijewa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/axozafanopaparuxexarati.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/sivosagopazel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1fe52d6a4---vuloxezapedikej.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/33006480207.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/kusakaxaratas.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/87291181082.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/24427510329.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/wevadamas.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/18979808949.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc55f53c48---ratodu.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/76776175117.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/55353668530.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/sarefukekek.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/fokijitim.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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 10896 bytes
SHA-256: 04a2384f7941d0cba5b852750b45e508a5c8125a44575bbbe0843cd213657c54
font_01_sfnt_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 15380 bytes
SHA-256: d40bd137408f190fb6bc81f6f3ed70cb8bb5298cbd5a8b2173c928c37dbd245c
font_02_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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