Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5921e5b5535a9d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 03:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44d10294b6e76948631b4b74b1dd8494 SHA-1: 68ccbd2f4c7de4bffbdeccaefc6a5e6e280e49b7 SHA-256: 9e5921e5b5535a9db11912f300be0d693e33be1ddb235efe1f523b191fb7b261
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm designed to manipulate search engine results. The presence of external URIs and link farms suggests an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://partnercable.hu/files/12518396397.pdf In PDF document text
    • http://fermobkorea.com/userfiles/file/20210911143841.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142588ef00ce---25289847532.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/86474230922.pdfIn PDF document text
    • http://humanlitech.com/files/files/96020624186.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/70947525684.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/sesetekonawolemogol.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bsg12kpoqhn1c425rsq0h3j865/69701491973.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/rujuwajuz.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/kazupegonatekalare.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/jikazaxugazusumito.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/lebog.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130950aae98d---70941734377.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109091612063199.pdfIn PDF document text
    • https://ekransamara.ru/files/22018779232.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109171750045884.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77223660631.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/75736236794.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jelaverukob.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/ripufin.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/24939502661.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vejujoguwasipop.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/depubotawanotiluzove.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/70642014762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+restore+deleted+contacts+from+androidPDF 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_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 17156 bytes
SHA-256: 65eac573462f9ada12a2a922a32ae2736923505b3d4b32d3b586cc4dda2f489e
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 10712 bytes
SHA-256: 7eac5cf032bf8020d9118a0cc5d523fdb2e27e029ccdfca5bce104731e27c973
font_02_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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