Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f913184bf5a06…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 16:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cc2b275b172dc08d8021c1712a1d3c37 SHA-1: 39e57e6e61e9373f6f68db0ac9fea12c2244e5bd SHA-256: b89f913184bf5a06a888ee640f75734c912a9e62b2de9aad6ae3834911977955
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://rkdestate.com/userfiles/file/tofudakidakeruxarudake.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a647980a45d---78202368889.pdfIn PDF document text
    • http://sgpeo.pl/users//file/koxadajifetafagak.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/96092527111.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/vonujukegizixorimes.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/dugusugamasokenotutevop.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/gasotobinusojuwemajeta.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aba576a4f2b47f6218e082fd0ae61b44/lamaxutilifedigaj.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/24f413d5378a3be5c88b33b5bbe83a67/vaxajomadeviwiwiwo.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/42728215358.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/jakavosuxe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c414573968f---wenasozorotabiwimu.pdfIn PDF document text
    • http://orrizon.ru/images/file/lakevinadaxilizuvabamim.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/gewikowitoxabujize.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/29870139061.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/wosakarigameliveluk.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/22506163534.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bdc0b9cb4---vifoni.pdfIn PDF document text
    • http://amdind.com/userfiles/file/waselofigowuwobupujowi.pdfIn PDF document text
    • http://cl-pub.com/files/files/64141884858.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/dosafipuwokarajote.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/27128162424.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32806068702.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/79204967683.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608505bf8af4a---25666950267.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/5504563548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+word+viablePDF 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_off0000bd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8A 10548 bytes
SHA-256: 74dba7448dc5589833a9acff5332c96c4e2798d8788c7c670a4bb79341b8d807
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 17072 bytes
SHA-256: c3b7f8b87692e71090d85b767e8fb690ce6dd93ca4b9747e37f4cbddf81e53bd

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