Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a81628b38b50b0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 02:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 906c6590be44e7333438de0ed7dbb129 SHA-1: 4cba78df68684d32deebc50dfe717486dc11c6a5 SHA-256: 05a81628b38b50b0f49ae454cc37357e7629bfa17abb4d0823a27b6cf91498a1
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The PDF structure and the nature of the URLs strongly suggest it's delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad6016398---valesu.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1633af6a---ripukozunivavog.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f983642de0---ragesubalurep.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/15279224768.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zaxuz.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eff0aac15ba---zozexulerigalarodi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3602942aef---tezaniwofapomefibefojun.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e14369f6dbaa8dc0bc1e5c54e9f69904/lubedigejevamokuroxepod.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/56165925904.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0e31fabb---walexiledawefomifagekuf.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/walugabotav.pdfIn PDF document text
    • http://dzbnf.com/upload/file///47432779526.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/78536006559.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/59340543812.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zonudujawune.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/zasopedopudut.pdfIn PDF document text
    • https://unitjaya.com/contents/files/72471777950.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0bb25cac618d0c819ad10fd6b8f9355c/25609073656.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b3f186bb83796993e0d85ab46479f9d8/72855026000.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/fapukujiwanezememuruva.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/dagavepugarol.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3eubodov8rdta0raqorue854o/77994349733.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/4100384941.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/92728101948.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/balosozifewowoteriribok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tower+country+chalet+parkPDF 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_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 18236 bytes
SHA-256: 2209281d7e718dbb84efae4789e2e8dad8439d4cca920b1f05551b0905c7c448
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 10564 bytes
SHA-256: 853067867bd419db0f980f7eb667459b90b4ef80a0088ec137f999ea9af067ac
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.