Malicious PDF — malware analysis report

Static analysis result for SHA-256 088586f3007982c4…

MALICIOUS

PDF

83.2 KB Created: 2021-07-15 09:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba9443c5349c64e9f237c7ac8ccc087c SHA-1: 732983c91a15cc935696e4f46d51d02ec686c85d SHA-256: 088586f3007982c413ccb45e3d96fdbf4d959761ddfec0c89b56e84d9a6986fd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://dodatnojamstvo.com/userfiles/file/vapunumonobodazulogitove.pdf In PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/35677070899.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/ligefi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1f6c3a423a67244ff323663f45275daa/nodup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821d0caf4---31559064510.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/joranopogav.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kemaxaserizoxezevotatemig.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/30272497212.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3p67cj31k39agigs97c8skcrn6/31873930638.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ab2ab338---bobaxefuboferaxepaja.pdfIn PDF document text
    • https://506hlapeta.com/files/file/22943892692.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/vodejufi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4aa50c22b---pumitipakilelelo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01b4309e2f126e6096ccd54ab1f7a491/85339676881.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/985460a7bc2c7b7cbc6f755b221e4021/gutaxujedezixudex.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b77382d2409---vovugeveloteje.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/rujotunoguviliwazi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707f3614df---jumaxulugagoderofenefuwod.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/41605463637.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/jefoxunanix.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/japirekivupugabika.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872812e88df---xulovururibifejekizuwile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=itinerary+plan+examplePDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16992 bytes
SHA-256: 07920027db3a665d0f30b25fa114a14816c351823c8cbd87a774e4c5adb522c7
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 10292 bytes
SHA-256: a4bae380552e369bee765abdbc0483fce66d95dd8cad0f67bf73a4ed19c07816