Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7a25a5f3af35ae…

MALICIOUS

PDF

83.2 KB Created: 2021-08-31 03:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b7c033b826206365f08e555681dd2e9 SHA-1: c5b619340d4056c975fdcee38b3922a62039157e SHA-256: bb7a25a5f3af35ae15bedd8fa59f71d7ebce98c8e4c274b7f13315e49d3490c8
104 Risk Score

Malware Insights

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

The sample is identified as malicious by an ML classifier and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The heuristics indicate the PDF is designed to host a large number of links, some of which are hosted on compromised CMS uploads, suggesting a tactic to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ndt-tl.ru/upload/file/pudazi.pdf In PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5c566216accf991d1ef447de4c17698f/13333788561.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5abe738db53192f8b9ed336c8fd59455/461552177.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/nisuzafo.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/tenuremuvoreko.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xamuze.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5342ca5b---35854078480.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7821e2becf---witaguvezotakizob.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7f8fd6c073650588795dc4895e0ce968/tuburedilakaregemij.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0015b6e5---37261661576.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e677961c5ac550d127e9f4506f4e7a7/54871937489.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f268bac97119e241a43c37c288b2e11e/96751765640.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fa71366d85300dc202dbce21d3a50766/tadinibolezirawati.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202108171436395588.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1cc74688d---45036654769.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d407b45e571a37f8ec3d325a2ebf3a39/42239811355.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4c3d63b9c7dfa66fc7892ab7c3393d1f/15025164080.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bkpro8voinijnh3kkhu7nssbgf/gitunusaregulula.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210702_092219.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/tomanatevozawilet.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/87822463102.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d2f250f7---kixazituzavuxaseki.pdfIn PDF document text
    • http://apsons.eu/files/file/36980920343.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/munovolasekanas.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/4104949592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=excretory+system+questions+and+answersPDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 11016 bytes
SHA-256: 452cfae7e823dcc4d0edb6bf669f46c32232c0441fed44cdddd389a289ceecba
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 18172 bytes
SHA-256: 766040579db0e793d3bba46a0aea53e1c93c4c0403625464d325d8cfcbf4db66
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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