Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d619fa98a2ca164…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 12:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef1e1c3616a0b134882e23ad6ca06339 SHA-1: 7dc0fa3fbaedb76cb375260c2048853a280fd811 SHA-256: 7d619fa98a2ca1647c6e7fb4053a6c61d2a1d4f9025e601e03fa50a066f3abaf
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e1360d0eb69938f4f1f52f1dee77b5/26761812881.pdf In PDF document text
    • https://magerp.org/upload/files/1519301879.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/josowavavunodaropoko.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dokov.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/81712414132.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ftht057p1lsi3m324dtt8dol6v/xudusejunumotowazemiv.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108251535073483.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/loromisesekuzijipepore.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xanevexawobu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/26311797714.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b27a7ef---18688591067.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f56fad5b2c18e6bf6922669631550744/62265806288.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f9b01676---kakewiziwewujutiga.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/92086149191.pdfIn PDF document text
    • https://autopratichesas.it/file/95588283017.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54177657748.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/26656728769.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23dd2db895---fakugowutoz.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5a84ee51---fabiwobaseresunakuselo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/60927227599.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4839f0061---30545250724.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/91763915229.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/424ce948d31c988cb9a279d101482160/xitupanirux.pdfIn PDF document text
    • https://riwg.in/userfiles/file/62354108307.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vawamusebagudexelavemagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nibo+bundy+clock+manualPDF 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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 18060 bytes
SHA-256: f76c6c9c5503490cf2ed275c127588049af8a95d9d7e90f8d6eeb9f1424f90f0
font_02_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10456 bytes
SHA-256: 95cff3c4a65f67236128ccbfcbc9035329fa1ff58b15b77a27e1a82048494c35